TSTP Solution File: LCL096-1 by Bliksem---1.12

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Bliksem---1.12
% Problem  : LCL096-1 : TPTP v8.1.0. Released v1.0.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : bliksem %s

% Computer : n010.cluster.edu
% Model    : x86_64 x86_64
% CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory   : 8042.1875MB
% OS       : Linux 3.10.0-693.el7.x86_64
% CPULimit : 300s
% WCLimit  : 0s
% DateTime : Sun Jul 17 07:50:16 EDT 2022

% Result   : Unsatisfiable 1.48s 1.85s
% Output   : Refutation 1.48s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.09/0.11  % Problem  : LCL096-1 : TPTP v8.1.0. Released v1.0.0.
% 0.09/0.12  % Command  : bliksem %s
% 0.12/0.32  % Computer : n010.cluster.edu
% 0.12/0.32  % Model    : x86_64 x86_64
% 0.12/0.32  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.32  % Memory   : 8042.1875MB
% 0.12/0.32  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.12/0.32  % CPULimit : 300
% 0.12/0.32  % DateTime : Sun Jul  3 04:19:03 EDT 2022
% 0.12/0.32  % CPUTime  : 
% 1.48/1.85  *** allocated 10000 integers for termspace/termends
% 1.48/1.85  *** allocated 10000 integers for clauses
% 1.48/1.85  *** allocated 10000 integers for justifications
% 1.48/1.85  Bliksem 1.12
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Automatic Strategy Selection
% 1.48/1.85  
% 1.48/1.85  Clauses:
% 1.48/1.85  [
% 1.48/1.85     [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), ~( 'is_a_theorem'( X ) ), 
% 1.48/1.85    'is_a_theorem'( Y ) ],
% 1.48/1.85     [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.85    equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T )
% 1.48/1.85     ) ],
% 1.48/1.85     [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.85    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( 
% 1.48/1.85    equivalent( Y, Z ), T ) ), U ), U ) ) ],
% 1.48/1.85     [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( X, Y )
% 1.48/1.85    , Z ), T ), equivalent( equivalent( equivalent( X, U ), Z ), equivalent( 
% 1.48/1.85    equivalent( Y, U ), T ) ) ) ) ],
% 1.48/1.85     [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a, equivalent( 
% 1.48/1.85    equivalent( b, b ), a ) ), c ), c ) ) ) ]
% 1.48/1.85  ] .
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  percentage equality = 0.000000, percentage horn = 1.000000
% 1.48/1.85  This is a near-Horn, non-equality  problem
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Options Used:
% 1.48/1.85  
% 1.48/1.85  useres =            1
% 1.48/1.85  useparamod =        0
% 1.48/1.85  useeqrefl =         0
% 1.48/1.85  useeqfact =         0
% 1.48/1.85  usefactor =         1
% 1.48/1.85  usesimpsplitting =  0
% 1.48/1.85  usesimpdemod =      0
% 1.48/1.85  usesimpres =        4
% 1.48/1.85  
% 1.48/1.85  resimpinuse      =  1000
% 1.48/1.85  resimpclauses =     20000
% 1.48/1.85  substype =          standard
% 1.48/1.85  backwardsubs =      1
% 1.48/1.85  selectoldest =      5
% 1.48/1.85  
% 1.48/1.85  litorderings [0] =  split
% 1.48/1.85  litorderings [1] =  liftord
% 1.48/1.85  
% 1.48/1.85  termordering =      none
% 1.48/1.85  
% 1.48/1.85  litapriori =        1
% 1.48/1.85  termapriori =       0
% 1.48/1.85  litaposteriori =    0
% 1.48/1.85  termaposteriori =   0
% 1.48/1.85  demodaposteriori =  0
% 1.48/1.85  ordereqreflfact =   0
% 1.48/1.85  
% 1.48/1.85  litselect =         negative
% 1.48/1.85  
% 1.48/1.85  maxweight =         30000
% 1.48/1.85  maxdepth =          30000
% 1.48/1.85  maxlength =         115
% 1.48/1.85  maxnrvars =         195
% 1.48/1.85  excuselevel =       0
% 1.48/1.85  increasemaxweight = 0
% 1.48/1.85  
% 1.48/1.85  maxselected =       10000000
% 1.48/1.85  maxnrclauses =      10000000
% 1.48/1.85  
% 1.48/1.85  showgenerated =    0
% 1.48/1.85  showkept =         0
% 1.48/1.85  showselected =     0
% 1.48/1.85  showdeleted =      0
% 1.48/1.85  showresimp =       1
% 1.48/1.85  showstatus =       2000
% 1.48/1.85  
% 1.48/1.85  prologoutput =     1
% 1.48/1.85  nrgoals =          5000000
% 1.48/1.85  totalproof =       1
% 1.48/1.85  
% 1.48/1.85  Symbols occurring in the translation:
% 1.48/1.85  
% 1.48/1.85  {}  [0, 0]      (w:1, o:2, a:1, s:1, b:0), 
% 1.48/1.85  .  [1, 2]      (w:1, o:23, a:1, s:1, b:0), 
% 1.48/1.85  !  [4, 1]      (w:1, o:17, a:1, s:1, b:0), 
% 1.48/1.85  =  [13, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 1.48/1.85  ==>  [14, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 1.48/1.85  equivalent  [41, 2]      (w:1, o:48, a:1, s:1, b:0), 
% 1.48/1.85  'is_a_theorem'  [42, 1]      (w:1, o:22, a:1, s:1, b:0), 
% 1.48/1.85  a  [46, 0]      (w:1, o:14, a:1, s:1, b:0), 
% 1.48/1.85  b  [47, 0]      (w:1, o:15, a:1, s:1, b:0), 
% 1.48/1.85  c  [48, 0]      (w:1, o:16, a:1, s:1, b:0).
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Starting Search:
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    4097
% 1.48/1.85  Kept:         2003
% 1.48/1.85  Inuse:        215
% 1.48/1.85  Deleted:      3
% 1.48/1.85  Deletedinuse: 2
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    9718
% 1.48/1.85  Kept:         4033
% 1.48/1.85  Inuse:        371
% 1.48/1.85  Deleted:      13
% 1.48/1.85  Deletedinuse: 4
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    14766
% 1.48/1.85  Kept:         6111
% 1.48/1.85  Inuse:        447
% 1.48/1.85  Deleted:      13
% 1.48/1.85  Deletedinuse: 4
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    20635
% 1.48/1.85  Kept:         8206
% 1.48/1.85  Inuse:        517
% 1.48/1.85  Deleted:      13
% 1.48/1.85  Deletedinuse: 4
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    29038
% 1.48/1.85  Kept:         10209
% 1.48/1.85  Inuse:        642
% 1.48/1.85  Deleted:      13
% 1.48/1.85  Deletedinuse: 4
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    38887
% 1.48/1.85  Kept:         12326
% 1.48/1.85  Inuse:        747
% 1.48/1.85  Deleted:      13
% 1.48/1.85  Deletedinuse: 4
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    48351
% 1.48/1.85  Kept:         14349
% 1.48/1.85  Inuse:        872
% 1.48/1.85  Deleted:      23
% 1.48/1.85  Deletedinuse: 4
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    57276
% 1.48/1.85  Kept:         16350
% 1.48/1.85  Inuse:        976
% 1.48/1.85  Deleted:      24
% 1.48/1.85  Deletedinuse: 4
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    61664
% 1.48/1.85  Kept:         18354
% 1.48/1.85  Inuse:        1049
% 1.48/1.85  Deleted:      24
% 1.48/1.85  Deletedinuse: 4
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  Resimplifying clauses:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Intermediate Status:
% 1.48/1.85  Generated:    69166
% 1.48/1.85  Kept:         20502
% 1.48/1.85  Inuse:        1131
% 1.48/1.85  Deleted:      83
% 1.48/1.85  Deletedinuse: 4
% 1.48/1.85  
% 1.48/1.85  Resimplifying inuse:
% 1.48/1.85  Done
% 1.48/1.85  
% 1.48/1.85  
% 1.48/1.85  Bliksems!, er is een bewijs:
% 1.48/1.85  % SZS status Unsatisfiable
% 1.48/1.85  % SZS output start Refutation
% 1.48/1.85  
% 1.48/1.85  clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y )
% 1.48/1.85    , ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 1, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.85    equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T )
% 1.48/1.85     ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.85    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( 
% 1.48/1.85    equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 3, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.85    X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U ), Z ), 
% 1.48/1.85    equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 4, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a, 
% 1.48/1.85    equivalent( equivalent( b, b ), a ) ), c ), c ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 5, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 1.48/1.85    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 1.48/1.85     ) ), equivalent( Y, Z ) ), T ), T ), U ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 6, [ 'is_a_theorem'( W ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 1.48/1.85    equivalent( equivalent( equivalent( X, Y ), Z ), T ), equivalent( 
% 1.48/1.85    equivalent( equivalent( X, U ), Z ), equivalent( equivalent( Y, U ), T )
% 1.48/1.85     ) ), W ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 7, [ 'is_a_theorem'( W ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 1.48/1.85    equivalent( equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.85    equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ), U
% 1.48/1.85     ), W ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 8, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( X
% 1.48/1.85    , Y ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.85    equivalent( X, Y ), equivalent( X, Z ) ), T ), U ), equivalent( 
% 1.48/1.85    equivalent( equivalent( Y, Z ), T ), U ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 10, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.85    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 11, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.85    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 1.48/1.85    , Z ), T ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 12, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 1.48/1.85     ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), Z ) )
% 1.48/1.85     ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 13, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.85    equivalent( X, Z ) ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 14, [ 'is_a_theorem'( equivalent( X, X ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 15, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.85    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), 
% 1.48/1.85    equivalent( Y, Z ) ), T ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 16, [ 'is_a_theorem'( Y ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.85    equivalent( X, X ), Y ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 17, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( Y, Y )
% 1.48/1.85    , X ) ) ) ] )
% 1.48/1.85  .
% 1.48/1.85  clause( 23, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( X, equivalent( equivalent( Y, Y ), X ) ), Z ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 27, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U
% 1.48/1.86     ), W ), equivalent( equivalent( equivalent( equivalent( Y, Z ), T ), U )
% 1.48/1.86    , W ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 38, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 1.48/1.86     ), equivalent( equivalent( equivalent( T, X ), equivalent( T, Y ) ), Z )
% 1.48/1.86     ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 57, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 62, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X ), 
% 1.48/1.86    equivalent( Z, Y ) ) ), T ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 78, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( equivalent( 
% 1.48/1.86    T, Y ), equivalent( equivalent( X, T ), Z ) ) ), U ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 94, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, Z )
% 1.48/1.86     ), equivalent( equivalent( equivalent( Y, T ), X ), equivalent( T, Z ) )
% 1.48/1.86     ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 98, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( equivalent( Z, X ), T ) ), equivalent( equivalent( Z, Y ), T
% 1.48/1.86     ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 101, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ), Z ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 109, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, X ), Y ), Z ), 
% 1.48/1.86    equivalent( Y, Z ) ), T ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 135, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X
% 1.48/1.86     ), T ) ), equivalent( equivalent( Z, Y ), T ) ), U ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 182, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Y ) ), Z ), Z ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 184, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Y
% 1.48/1.86     ) ), Z ), Z ), T ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 683, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    equivalent( Z, X ), equivalent( equivalent( T, Z ), equivalent( T, Y ) )
% 1.48/1.86     ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 716, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), equivalent( Y, T ) ) ), equivalent( equivalent( U, X
% 1.48/1.86     ), equivalent( U, equivalent( Z, T ) ) ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 1847, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, X )
% 1.48/1.86    , Y ), Y ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 1848, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, X ), Y ), Y ), Z ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 1948, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( Y, Y ) ), equivalent( X, Z ) ), Z ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 1962, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, equivalent( Y, Y ) ), equivalent( 
% 1.48/1.86    X, Z ) ), Z ), T ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 5780, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 1.48/1.86    , equivalent( equivalent( Y, X ), Z ) ), Z ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 5915, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( equivalent( Y, X
% 1.48/1.86     ), Z ) ), Z ), T ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 6533, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), T ) ), equivalent( equivalent( equivalent( Z, Y ), X
% 1.48/1.86     ), T ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 14502, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), equivalent( Z, T ) ), equivalent( Z, U )
% 1.48/1.86     ) ), equivalent( X, equivalent( T, U ) ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 20981, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( equivalent( X, equivalent( Y, Y ) ), Z ) ), T ), equivalent( 
% 1.48/1.86    Z, T ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 21106, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), Z ), Z ), X ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 21182, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( X, equivalent( equivalent( equivalent( equivalent( Y, Y ), Z
% 1.48/1.86     ), Z ), X ) ), T ) ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 21461, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( equivalent( Y, Y ), X ) ), Z ), Z ) ) ] )
% 1.48/1.86  .
% 1.48/1.86  clause( 21567, [] )
% 1.48/1.86  .
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  % SZS output end Refutation
% 1.48/1.86  found a proof!
% 1.48/1.86  
% 1.48/1.86  % ABCDEFGHIJKLMNOPQRSTUVWXYZ
% 1.48/1.86  
% 1.48/1.86  initialclauses(
% 1.48/1.86  [ clause( 21569, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), ~( 
% 1.48/1.86    'is_a_theorem'( X ) ), 'is_a_theorem'( Y ) ] )
% 1.48/1.86  , clause( 21570, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 1.48/1.86     ), T ), T ) ) ] )
% 1.48/1.86  , clause( 21571, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 1.48/1.86    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 1.48/1.86  , clause( 21572, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 1.48/1.86    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 1.48/1.86  , clause( 21573, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a
% 1.48/1.86    , equivalent( equivalent( b, b ), a ) ), c ), c ) ) ) ] )
% 1.48/1.86  ] ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y )
% 1.48/1.86    , ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , clause( 21569, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), ~( 
% 1.48/1.86    'is_a_theorem'( X ) ), 'is_a_theorem'( Y ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 1.48/1.86     ), ==>( 1, 2 ), ==>( 2, 1 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 1, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T )
% 1.48/1.86     ) ] )
% 1.48/1.86  , clause( 21570, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 1.48/1.86     ), T ), T ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( 
% 1.48/1.86    equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 1.48/1.86  , clause( 21571, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 1.48/1.86    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 3, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.86    X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U ), Z ), 
% 1.48/1.86    equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 1.48/1.86  , clause( 21572, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 1.48/1.86    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 4, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a, 
% 1.48/1.86    equivalent( equivalent( b, b ), a ) ), c ), c ) ) ) ] )
% 1.48/1.86  , clause( 21573, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a
% 1.48/1.86    , equivalent( equivalent( b, b ), a ) ), c ), c ) ) ) ] )
% 1.48/1.86  , substitution( 0, [] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21575, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), 
% 1.48/1.86    equivalent( Y, Z ) ), T ), T ), U ) ) ), 'is_a_theorem'( U ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 1, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 1.48/1.86     ), T ), T ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 1.48/1.86     ), T ), T ) ), :=( Y, U )] ), substitution( 1, [ :=( X, X ), :=( Y, Y )
% 1.48/1.86    , :=( Z, Z ), :=( T, T )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 5, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 1.48/1.86     ) ), equivalent( Y, Z ) ), T ), T ), U ) ) ) ] )
% 1.48/1.86  , clause( 21575, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), 
% 1.48/1.86    equivalent( Y, Z ) ), T ), T ), U ) ) ), 'is_a_theorem'( U ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21577, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), Z ), T ), equivalent( equivalent( 
% 1.48/1.86    equivalent( X, U ), Z ), equivalent( equivalent( Y, U ), T ) ) ), W ) ) )
% 1.48/1.86    , 'is_a_theorem'( W ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 3, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 1.48/1.86    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 1.48/1.86    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ), :=( Y, W )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 6, [ 'is_a_theorem'( W ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), Z ), T ), equivalent( 
% 1.48/1.86    equivalent( equivalent( X, U ), Z ), equivalent( equivalent( Y, U ), T )
% 1.48/1.86     ) ), W ) ) ) ] )
% 1.48/1.86  , clause( 21577, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), Z ), T ), equivalent( equivalent( 
% 1.48/1.86    equivalent( X, U ), Z ), equivalent( equivalent( Y, U ), T ) ) ), W ) ) )
% 1.48/1.86    , 'is_a_theorem'( W ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U ), :=( W, W )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21579, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 1.48/1.86     ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ), U ), W ) ) ), 
% 1.48/1.86    'is_a_theorem'( W ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 1.48/1.86    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 1.48/1.86    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ), :=( Y, W )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 7, [ 'is_a_theorem'( W ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ), U
% 1.48/1.86     ), W ) ) ) ] )
% 1.48/1.86  , clause( 21579, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 1.48/1.86     ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ), U ), W ) ) ), 
% 1.48/1.86    'is_a_theorem'( W ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U ), :=( W, W )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21580, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    X, Y ) ) ) ] )
% 1.48/1.86  , clause( 5, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T ), U ) ) ) ] )
% 1.48/1.86  , 1, clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 1.48/1.86    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Z ), :=( Y, X ), :=( Z, Y ), :=( T, 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Y ) ) ), :=( U, equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Y ) ) )] ), substitution( 1, [ :=( X, 
% 1.48/1.86    Z ), :=( Y, X ), :=( Z, Y ), :=( T, equivalent( X, Y ) ), :=( U, 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Y ) ) )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 8, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( X
% 1.48/1.86    , Y ) ) ) ] )
% 1.48/1.86  , clause( 21580, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Y ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 1.48/1.86     )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21581, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U ), 
% 1.48/1.86    equivalent( equivalent( equivalent( Y, Z ), T ), U ) ) ) ] )
% 1.48/1.86  , clause( 5, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T ), U ) ) ) ] )
% 1.48/1.86  , 1, clause( 3, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 1.48/1.86    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, U ), 
% 1.48/1.86    :=( U, equivalent( equivalent( equivalent( equivalent( equivalent( X, Y )
% 1.48/1.86    , equivalent( X, Z ) ), T ), U ), equivalent( equivalent( equivalent( Y, 
% 1.48/1.86    Z ), T ), U ) ) )] ), substitution( 1, [ :=( X, equivalent( equivalent( X
% 1.48/1.86    , Y ), equivalent( X, Z ) ) ), :=( Y, equivalent( Y, Z ) ), :=( Z, U ), 
% 1.48/1.86    :=( T, U ), :=( U, T )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Z ) ), T ), U ), equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Z ), T ), U ) ) ) ] )
% 1.48/1.86  , clause( 21581, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U ), 
% 1.48/1.86    equivalent( equivalent( equivalent( Y, Z ), T ), U ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21583, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    Y ), equivalent( X, Y ) ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 8, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Y ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    X, Y ) ) ), :=( Y, Z )] ), substitution( 1, [ :=( X, X ), :=( Y, Y )] )
% 1.48/1.86    ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 10, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 1.48/1.86  , clause( 21583, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 1.48/1.86    , Y ), equivalent( X, Y ) ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21584, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 1.48/1.86    , Z ), T ) ) ) ] )
% 1.48/1.86  , clause( 10, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 1.48/1.86  , 1, clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 1.48/1.86    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Z ) ), T ) ), :=( Y, equivalent( equivalent( Y, Z ), T ) )
% 1.48/1.86    , :=( Z, equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ) )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, 
% 1.48/1.86    Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ) )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 11, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 1.48/1.86    , Z ), T ) ) ) ] )
% 1.48/1.86  , clause( 21584, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 1.48/1.86    , Z ), T ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21585, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 1.48/1.86    , Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), Z
% 1.48/1.86     ) ) ) ) ] )
% 1.48/1.86  , clause( 10, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 1.48/1.86  , 1, clause( 3, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 1.48/1.86    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( X, T ) ), :=( Y, Z ), :=( Z, 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( equivalent( 
% 1.48/1.86    T, Y ), equivalent( equivalent( X, T ), Z ) ) ) )] ), substitution( 1, [ 
% 1.48/1.86    :=( X, X ), :=( Y, T ), :=( Z, Z ), :=( T, equivalent( equivalent( X, T )
% 1.48/1.86    , Z ) ), :=( U, Y )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 12, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 1.48/1.86     ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), Z ) )
% 1.48/1.86     ) ) ] )
% 1.48/1.86  , clause( 21585, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), 
% 1.48/1.86    Z ) ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21586, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 1.48/1.86    , equivalent( X, Z ) ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , clause( 10, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 1.48/1.86  , 1, clause( 1, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 1.48/1.86     ), T ), T ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    X, Z ) ) ), :=( Y, equivalent( Y, Z ) ), :=( Z, equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z ) ) )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 1.48/1.86     ) )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 13, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Z ) ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , clause( 21586, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), equivalent( X, Z ) ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21587, [ 'is_a_theorem'( equivalent( X, X ) ) ] )
% 1.48/1.86  , clause( 10, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 1.48/1.86  , 1, clause( 13, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), equivalent( X, Z ) ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Y ), :=( Y, X ), :=( Z, equivalent( X, X ) )] )
% 1.48/1.86    , substitution( 1, [ :=( X, Y ), :=( Y, X ), :=( Z, X )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 14, [ 'is_a_theorem'( equivalent( X, X ) ) ] )
% 1.48/1.86  , clause( 21587, [ 'is_a_theorem'( equivalent( X, X ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21589, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z ) ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 13, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), equivalent( X, Z ) ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Z ) ), equivalent( Y, Z ) ) ), :=( Y, T )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 15, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), 
% 1.48/1.86    equivalent( Y, Z ) ), T ) ) ) ] )
% 1.48/1.86  , clause( 21589, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z ) ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21591, [ ~( 'is_a_theorem'( equivalent( equivalent( X, X ), Y ) ) )
% 1.48/1.86    , 'is_a_theorem'( Y ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 14, [ 'is_a_theorem'( equivalent( X, X ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( X, X ) ), :=( Y, Y )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 16, [ 'is_a_theorem'( Y ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ) ) ) ] )
% 1.48/1.86  , clause( 21591, [ ~( 'is_a_theorem'( equivalent( equivalent( X, X ), Y ) )
% 1.48/1.86     ), 'is_a_theorem'( Y ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 1
% 1.48/1.86     ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21592, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( Y, 
% 1.48/1.86    Y ), X ) ) ) ] )
% 1.48/1.86  , clause( 6, [ 'is_a_theorem'( W ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, Y ), Z ), T ), 
% 1.48/1.86    equivalent( equivalent( equivalent( X, U ), Z ), equivalent( equivalent( 
% 1.48/1.86    Y, U ), T ) ) ), W ) ) ) ] )
% 1.48/1.86  , 1, clause( 13, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), equivalent( X, Z ) ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Z ), :=( Y, Y ), :=( Z, T ), :=( T, X ), 
% 1.48/1.86    :=( U, Y ), :=( W, equivalent( X, equivalent( equivalent( Y, Y ), X ) ) )] )
% 1.48/1.86    , substitution( 1, [ :=( X, equivalent( equivalent( Z, Y ), T ) ), :=( Y
% 1.48/1.86    , X ), :=( Z, equivalent( equivalent( Y, Y ), X ) )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 17, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( Y, Y )
% 1.48/1.86    , X ) ) ) ] )
% 1.48/1.86  , clause( 21592, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( Y
% 1.48/1.86    , Y ), X ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 1.48/1.86     )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21594, [ ~( 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Y ), X ) ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 17, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( Y
% 1.48/1.86    , Y ), X ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( X, equivalent( equivalent( Y, Y
% 1.48/1.86     ), X ) ) ), :=( Y, Z )] ), substitution( 1, [ :=( X, X ), :=( Y, Y )] )
% 1.48/1.86    ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 23, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( X, equivalent( equivalent( Y, Y ), X ) ), Z ) ) ) ] )
% 1.48/1.86  , clause( 21594, [ ~( 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Y ), X ) ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21595, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U
% 1.48/1.86     ), W ), equivalent( equivalent( equivalent( equivalent( Y, Z ), T ), U )
% 1.48/1.86    , W ) ) ) ] )
% 1.48/1.86  , clause( 7, [ 'is_a_theorem'( W ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( equivalent( equivalent( X
% 1.48/1.86    , Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ), 
% 1.48/1.86    U ), U ), W ) ) ) ] )
% 1.48/1.86  , 1, clause( 3, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 1.48/1.86    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), 
% 1.48/1.86    :=( U, W ), :=( W, equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U ), W ), 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( Y, Z ), T ), U ), W ) ) )] )
% 1.48/1.86    , substitution( 1, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Z ) ), T ) ), :=( Y, equivalent( equivalent( Y, Z ), T ) )
% 1.48/1.86    , :=( Z, W ), :=( T, W ), :=( U, U )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 27, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U
% 1.48/1.86     ), W ), equivalent( equivalent( equivalent( equivalent( Y, Z ), T ), U )
% 1.48/1.86    , W ) ) ) ] )
% 1.48/1.86  , clause( 21595, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U
% 1.48/1.86     ), W ), equivalent( equivalent( equivalent( equivalent( Y, Z ), T ), U )
% 1.48/1.86    , W ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U ), :=( W, W )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21596, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 1.48/1.86    , Z ), equivalent( equivalent( equivalent( T, X ), equivalent( T, Y ) ), 
% 1.48/1.86    Z ) ) ) ] )
% 1.48/1.86  , clause( 16, [ 'is_a_theorem'( Y ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ) ) ) ] )
% 1.48/1.86  , 1, clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U ), 
% 1.48/1.86    equivalent( equivalent( equivalent( Y, Z ), T ), U ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( T, X ), 
% 1.48/1.86    equivalent( T, Y ) ), Z ) ), :=( Y, equivalent( equivalent( equivalent( X
% 1.48/1.86    , Y ), Z ), equivalent( equivalent( equivalent( T, X ), equivalent( T, Y
% 1.48/1.86     ) ), Z ) ) )] ), substitution( 1, [ :=( X, T ), :=( Y, X ), :=( Z, Y ), 
% 1.48/1.86    :=( T, Z ), :=( U, equivalent( equivalent( equivalent( T, X ), equivalent( 
% 1.48/1.86    T, Y ) ), Z ) )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 38, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 1.48/1.86     ), equivalent( equivalent( equivalent( T, X ), equivalent( T, Y ) ), Z )
% 1.48/1.86     ) ) ] )
% 1.48/1.86  , clause( 21596, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), Z ), equivalent( equivalent( equivalent( T, X ), equivalent( T, Y ) )
% 1.48/1.86    , Z ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21597, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 1.48/1.86  , clause( 16, [ 'is_a_theorem'( Y ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ) ) ) ] )
% 1.48/1.86  , 1, clause( 11, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 1.48/1.86    , Z ), T ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( Z, X ), equivalent( 
% 1.48/1.86    Z, Y ) ) ), :=( Y, equivalent( equivalent( X, Y ), equivalent( equivalent( 
% 1.48/1.86    Z, X ), equivalent( Z, Y ) ) ) )] ), substitution( 1, [ :=( X, Z ), :=( Y
% 1.48/1.86    , X ), :=( Z, Y ), :=( T, equivalent( equivalent( Z, X ), equivalent( Z, 
% 1.48/1.86    Y ) ) )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 57, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 1.48/1.86  , clause( 21597, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21599, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    Y ), equivalent( equivalent( Z, X ), equivalent( Z, Y ) ) ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 57, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    equivalent( Z, X ), equivalent( Z, Y ) ) ) ), :=( Y, T )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 62, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X ), 
% 1.48/1.86    equivalent( Z, Y ) ) ), T ) ) ) ] )
% 1.48/1.86  , clause( 21599, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 1.48/1.86    , Y ), equivalent( equivalent( Z, X ), equivalent( Z, Y ) ) ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21601, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), equivalent( 
% 1.48/1.86    equivalent( X, T ), Z ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 12, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), 
% 1.48/1.86    Z ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), Z )
% 1.48/1.86     ) ) ), :=( Y, U )] ), substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, 
% 1.48/1.86    Z ), :=( T, T )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 78, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( equivalent( 
% 1.48/1.86    T, Y ), equivalent( equivalent( X, T ), Z ) ) ), U ) ) ) ] )
% 1.48/1.86  , clause( 21601, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), equivalent( 
% 1.48/1.86    equivalent( X, T ), Z ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21602, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, 
% 1.48/1.86    Z ) ), equivalent( equivalent( equivalent( Y, T ), X ), equivalent( T, Z
% 1.48/1.86     ) ) ) ) ] )
% 1.48/1.86  , clause( 15, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), 
% 1.48/1.86    equivalent( Y, Z ) ), T ) ) ) ] )
% 1.48/1.86  , 1, clause( 12, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), 
% 1.48/1.86    Z ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Y ), :=( Y, T ), :=( Z, Z ), :=( T, 
% 1.48/1.86    equivalent( equivalent( X, equivalent( Y, Z ) ), equivalent( equivalent( 
% 1.48/1.86    equivalent( Y, T ), X ), equivalent( T, Z ) ) ) )] ), substitution( 1, [ 
% 1.48/1.86    :=( X, equivalent( Y, T ) ), :=( Y, equivalent( Y, Z ) ), :=( Z, 
% 1.48/1.86    equivalent( T, Z ) ), :=( T, X )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 94, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, Z )
% 1.48/1.86     ), equivalent( equivalent( equivalent( Y, T ), X ), equivalent( T, Z ) )
% 1.48/1.86     ) ) ] )
% 1.48/1.86  , clause( 21602, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y
% 1.48/1.86    , Z ) ), equivalent( equivalent( equivalent( Y, T ), X ), equivalent( T, 
% 1.48/1.86    Z ) ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21603, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 1.48/1.86    , equivalent( equivalent( Z, X ), T ) ), equivalent( equivalent( Z, Y ), 
% 1.48/1.86    T ) ) ) ] )
% 1.48/1.86  , clause( 15, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), 
% 1.48/1.86    equivalent( Y, Z ) ), T ) ) ) ] )
% 1.48/1.86  , 1, clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U ), 
% 1.48/1.86    equivalent( equivalent( equivalent( Y, Z ), T ), U ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( Z, X ) ), :=( Y, equivalent( Z, 
% 1.48/1.86    Y ) ), :=( Z, T ), :=( T, equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( equivalent( Z, X ), T ) ), equivalent( equivalent( Z, Y ), T
% 1.48/1.86     ) ) )] ), substitution( 1, [ :=( X, Z ), :=( Y, X ), :=( Z, Y ), :=( T, 
% 1.48/1.86    equivalent( equivalent( Z, X ), T ) ), :=( U, equivalent( equivalent( Z, 
% 1.48/1.86    Y ), T ) )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 98, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( equivalent( Z, X ), T ) ), equivalent( equivalent( Z, Y ), T
% 1.48/1.86     ) ) ) ] )
% 1.48/1.86  , clause( 21603, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), equivalent( equivalent( Z, X ), T ) ), equivalent( equivalent( Z, Y )
% 1.48/1.86    , T ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21604, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ), Z ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , clause( 23, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( X, equivalent( equivalent( Y, Y ), X ) ), Z ) ) ) ] )
% 1.48/1.86  , 1, clause( 94, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y
% 1.48/1.86    , Z ) ), equivalent( equivalent( equivalent( Y, T ), X ), equivalent( T, 
% 1.48/1.86    Z ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Z ), :=( Y, X ), :=( Z, equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, X ), Y ), Z ), equivalent( Y, Z )
% 1.48/1.86     ) )] ), substitution( 1, [ :=( X, Z ), :=( Y, equivalent( X, X ) ), :=( 
% 1.48/1.86    Z, Z ), :=( T, Y )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 101, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ), Z ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , clause( 21604, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ), Z ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21606, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, X ), Y ), Z ), equivalent( Y, Z ) ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 101, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ), Z ), equivalent( Y, Z ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ), Z ), equivalent( Y, Z ) ) ), :=( Y, T )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 109, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, X ), Y ), Z ), 
% 1.48/1.86    equivalent( Y, Z ) ), T ) ) ) ] )
% 1.48/1.86  , clause( 21606, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, X ), Y ), Z ), equivalent( Y, Z ) ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21608, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( equivalent( Z, X ), T ) ), equivalent( 
% 1.48/1.86    equivalent( Z, Y ), T ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 98, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), equivalent( equivalent( Z, X ), T ) ), equivalent( equivalent( Z, Y )
% 1.48/1.86    , T ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( equivalent( Z, X ), T ) ), equivalent( equivalent( Z, Y ), T
% 1.48/1.86     ) ) ), :=( Y, U )] ), substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, 
% 1.48/1.86    Z ), :=( T, T )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 135, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X
% 1.48/1.86     ), T ) ), equivalent( equivalent( Z, Y ), T ) ), U ) ) ) ] )
% 1.48/1.86  , clause( 21608, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( equivalent( Z, X ), T ) ), equivalent( 
% 1.48/1.86    equivalent( Z, Y ), T ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21609, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Y ) ), Z ), Z ) ) ] )
% 1.48/1.86  , clause( 5, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T ), U ) ) ) ] )
% 1.48/1.86  , 1, clause( 27, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U
% 1.48/1.86     ), W ), equivalent( equivalent( equivalent( equivalent( Y, Z ), T ), U )
% 1.48/1.86    , W ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, T ), :=( Y, X ), :=( Z, Y ), :=( T, Z ), 
% 1.48/1.86    :=( U, equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    X, Y ) ), Z ), Z ) )] ), substitution( 1, [ :=( X, T ), :=( Y, X ), :=( Z
% 1.48/1.86    , Y ), :=( T, equivalent( X, Y ) ), :=( U, Z ), :=( W, Z )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 182, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Y ) ), Z ), Z ) ) ] )
% 1.48/1.86  , clause( 21609, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Y ) ), Z ), Z ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21611, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ), Z ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 182, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Y ) ), Z ), Z ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( X, Y ) ), Z ), Z ) ), :=( Y, T )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 184, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Y
% 1.48/1.86     ) ), Z ), Z ), T ) ) ) ] )
% 1.48/1.86  , clause( 21611, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ), Z ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21612, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    equivalent( Z, X ), equivalent( equivalent( T, Z ), equivalent( T, Y ) )
% 1.48/1.86     ) ) ) ] )
% 1.48/1.86  , clause( 62, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X ), 
% 1.48/1.86    equivalent( Z, Y ) ) ), T ) ) ) ] )
% 1.48/1.86  , 1, clause( 12, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), 
% 1.48/1.86    Z ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Z ), :=( Y, Y ), :=( Z, T ), :=( T, 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X ), 
% 1.48/1.86    equivalent( equivalent( T, Z ), equivalent( T, Y ) ) ) ) )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, Z ), :=( Y, Y ), :=( Z, equivalent( equivalent( 
% 1.48/1.86    T, Z ), equivalent( T, Y ) ) ), :=( T, X )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 683, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    equivalent( Z, X ), equivalent( equivalent( T, Z ), equivalent( T, Y ) )
% 1.48/1.86     ) ) ) ] )
% 1.48/1.86  , clause( 21612, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( equivalent( Z, X ), equivalent( equivalent( T, Z ), 
% 1.48/1.86    equivalent( T, Y ) ) ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21613, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), equivalent( Y, T ) ) ), equivalent( equivalent( U, X
% 1.48/1.86     ), equivalent( U, equivalent( Z, T ) ) ) ) ) ] )
% 1.48/1.86  , clause( 15, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), 
% 1.48/1.86    equivalent( Y, Z ) ), T ) ) ) ] )
% 1.48/1.86  , 1, clause( 683, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( equivalent( Z, X ), equivalent( equivalent( T, Z ), 
% 1.48/1.86    equivalent( T, Y ) ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Y ), :=( Y, Z ), :=( Z, T ), :=( T, 
% 1.48/1.86    equivalent( equivalent( X, equivalent( equivalent( Y, Z ), equivalent( Y
% 1.48/1.86    , T ) ) ), equivalent( equivalent( U, X ), equivalent( U, equivalent( Z, 
% 1.48/1.86    T ) ) ) ) )] ), substitution( 1, [ :=( X, equivalent( equivalent( Y, Z )
% 1.48/1.86    , equivalent( Y, T ) ) ), :=( Y, equivalent( Z, T ) ), :=( Z, X ), :=( T
% 1.48/1.86    , U )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 716, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), equivalent( Y, T ) ) ), equivalent( equivalent( U, X
% 1.48/1.86     ), equivalent( U, equivalent( Z, T ) ) ) ) ) ] )
% 1.48/1.86  , clause( 21613, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), equivalent( Y, T ) ) ), equivalent( equivalent( U, X
% 1.48/1.86     ), equivalent( U, equivalent( Z, T ) ) ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21614, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, X )
% 1.48/1.86    , Y ), Y ) ) ] )
% 1.48/1.86  , clause( 184, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Y
% 1.48/1.86     ) ), Z ), Z ), T ) ) ) ] )
% 1.48/1.86  , 1, clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U ), 
% 1.48/1.86    equivalent( equivalent( equivalent( Y, Z ), T ), U ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Z ), :=( Y, X ), :=( Z, Y ), :=( T, 
% 1.48/1.86    equivalent( equivalent( equivalent( X, X ), Y ), Y ) )] ), substitution( 
% 1.48/1.86    1, [ :=( X, Z ), :=( Y, X ), :=( Z, X ), :=( T, Y ), :=( U, Y )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 1847, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, X )
% 1.48/1.86    , Y ), Y ) ) ] )
% 1.48/1.86  , clause( 21614, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, X
% 1.48/1.86     ), Y ), Y ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 1.48/1.86     )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21616, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ), Y ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 1847, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 1.48/1.86    , X ), Y ), Y ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, X ), 
% 1.48/1.86    Y ), Y ) ), :=( Y, Z )] ), substitution( 1, [ :=( X, X ), :=( Y, Y )] )
% 1.48/1.86    ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 1848, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, X ), Y ), Y ), Z ) ) ) ] )
% 1.48/1.86  , clause( 21616, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, X ), Y ), Y ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21617, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( Y, Y ) ), equivalent( X, Z ) ), Z ) ) ] )
% 1.48/1.86  , clause( 1848, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, X ), Y ), Y ), Z ) ) ) ] )
% 1.48/1.86  , 1, clause( 38, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), Z ), equivalent( equivalent( equivalent( T, X ), equivalent( T, Y ) )
% 1.48/1.86    , Z ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Y ), :=( Y, Z ), :=( Z, equivalent( 
% 1.48/1.86    equivalent( equivalent( X, equivalent( Y, Y ) ), equivalent( X, Z ) ), Z
% 1.48/1.86     ) )] ), substitution( 1, [ :=( X, equivalent( Y, Y ) ), :=( Y, Z ), :=( 
% 1.48/1.86    Z, Z ), :=( T, X )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 1948, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( Y, Y ) ), equivalent( X, Z ) ), Z ) ) ] )
% 1.48/1.86  , clause( 21617, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( Y, Y ) ), equivalent( X, Z ) ), Z ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21619, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, equivalent( Y, Y ) ), equivalent( X, Z ) ), Z ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 1948, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 1.48/1.86    , equivalent( Y, Y ) ), equivalent( X, Z ) ), Z ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( Y, Y ) ), equivalent( X, Z ) ), Z ) ), :=( Y, T )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 1962, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, equivalent( Y, Y ) ), equivalent( 
% 1.48/1.86    X, Z ) ), Z ), T ) ) ) ] )
% 1.48/1.86  , clause( 21619, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, equivalent( Y, Y ) ), equivalent( X, Z ) ), Z ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21620, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 1.48/1.86    , equivalent( equivalent( Y, X ), Z ) ), Z ) ) ] )
% 1.48/1.86  , clause( 1962, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, equivalent( Y, Y ) ), equivalent( 
% 1.48/1.86    X, Z ) ), Z ), T ) ) ) ] )
% 1.48/1.86  , 1, clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), U ), 
% 1.48/1.86    equivalent( equivalent( equivalent( Y, Z ), T ), U ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( Y, X ) ), :=( Y, Y ), :=( Z, Z )
% 1.48/1.86    , :=( T, equivalent( equivalent( equivalent( X, Y ), equivalent( 
% 1.48/1.86    equivalent( Y, X ), Z ) ), Z ) )] ), substitution( 1, [ :=( X, Y ), :=( Y
% 1.48/1.86    , X ), :=( Z, Y ), :=( T, equivalent( equivalent( Y, X ), Z ) ), :=( U, Z
% 1.48/1.86     )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 5780, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 1.48/1.86    , equivalent( equivalent( Y, X ), Z ) ), Z ) ) ] )
% 1.48/1.86  , clause( 21620, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), equivalent( equivalent( Y, X ), Z ) ), Z ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21622, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( equivalent( Y, X ), Z ) ), Z ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 5780, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 1.48/1.86    , Y ), equivalent( equivalent( Y, X ), Z ) ), Z ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 1.48/1.86    equivalent( equivalent( Y, X ), Z ) ), Z ) ), :=( Y, T )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 5915, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( equivalent( Y, X
% 1.48/1.86     ), Z ) ), Z ), T ) ) ) ] )
% 1.48/1.86  , clause( 21622, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 1.48/1.86    equivalent( X, Y ), equivalent( equivalent( Y, X ), Z ) ), Z ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21623, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), T ) ), equivalent( equivalent( equivalent( Z, Y ), X
% 1.48/1.86     ), T ) ) ) ] )
% 1.48/1.86  , clause( 5915, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( equivalent( Y, X
% 1.48/1.86     ), Z ) ), Z ), T ) ) ) ] )
% 1.48/1.86  , 1, clause( 12, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 1.48/1.86     ), Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), 
% 1.48/1.86    Z ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Z ), :=( Y, Y ), :=( Z, T ), :=( T, 
% 1.48/1.86    equivalent( equivalent( X, equivalent( equivalent( Y, Z ), T ) ), 
% 1.48/1.86    equivalent( equivalent( equivalent( Z, Y ), X ), T ) ) )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, equivalent( Z, Y ) ), :=( Y, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), T ) ), :=( Z, T ), :=( T, X )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 6533, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), T ) ), equivalent( equivalent( equivalent( Z, Y ), X
% 1.48/1.86     ), T ) ) ) ] )
% 1.48/1.86  , clause( 21623, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), T ) ), equivalent( equivalent( equivalent( Z, Y ), X
% 1.48/1.86     ), T ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21624, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), equivalent( Z, T ) ), equivalent( Z, U )
% 1.48/1.86     ) ), equivalent( X, equivalent( T, U ) ) ) ) ] )
% 1.48/1.86  , clause( 109, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( X, X ), Y ), Z ), 
% 1.48/1.86    equivalent( Y, Z ) ), T ) ) ) ] )
% 1.48/1.86  , 1, clause( 716, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), equivalent( Y, T ) ) ), equivalent( equivalent( U, X
% 1.48/1.86     ), equivalent( U, equivalent( Z, T ) ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Y ), :=( Y, equivalent( Z, T ) ), :=( Z, 
% 1.48/1.86    equivalent( Z, U ) ), :=( T, equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), equivalent( Z, T ) ), equivalent( Z, U )
% 1.48/1.86     ) ), equivalent( X, equivalent( T, U ) ) ) )] ), substitution( 1, [ :=( 
% 1.48/1.86    X, equivalent( equivalent( equivalent( Y, Y ), equivalent( Z, T ) ), 
% 1.48/1.86    equivalent( Z, U ) ) ), :=( Y, Z ), :=( Z, T ), :=( T, U ), :=( U, X )] )
% 1.48/1.86    ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 14502, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), equivalent( Z, T ) ), equivalent( Z, U )
% 1.48/1.86     ) ), equivalent( X, equivalent( T, U ) ) ) ) ] )
% 1.48/1.86  , clause( 21624, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), equivalent( Z, T ) ), equivalent( Z, U )
% 1.48/1.86     ) ), equivalent( X, equivalent( T, U ) ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 1.48/1.86    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21625, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( equivalent( X, equivalent( Y, Y ) ), Z ) ), T ), equivalent( 
% 1.48/1.86    Z, T ) ) ) ] )
% 1.48/1.86  , clause( 78, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( equivalent( 
% 1.48/1.86    T, Y ), equivalent( equivalent( X, T ), Z ) ) ), U ) ) ) ] )
% 1.48/1.86  , 1, clause( 14502, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), equivalent( Z, T ) ), equivalent( Z, U )
% 1.48/1.86     ) ), equivalent( X, equivalent( T, U ) ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, X ), :=( Y, equivalent( equivalent( X, 
% 1.48/1.86    equivalent( Y, Y ) ), Z ) ), :=( Z, T ), :=( T, equivalent( Y, Y ) ), 
% 1.48/1.86    :=( U, equivalent( equivalent( equivalent( X, equivalent( equivalent( X, 
% 1.48/1.86    equivalent( Y, Y ) ), Z ) ), T ), equivalent( Z, T ) ) )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( X, equivalent( Y, Y ) ), Z ) ), T ) ), :=( Y, Y ), :=( Z, 
% 1.48/1.86    equivalent( X, equivalent( Y, Y ) ) ), :=( T, Z ), :=( U, T )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 20981, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( equivalent( X, equivalent( Y, Y ) ), Z ) ), T ), equivalent( 
% 1.48/1.86    Z, T ) ) ) ] )
% 1.48/1.86  , clause( 21625, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( equivalent( X, equivalent( Y, Y ) ), Z ) ), T ), equivalent( 
% 1.48/1.86    Z, T ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21626, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), Z ), Z ), X ) ) ) ] )
% 1.48/1.86  , clause( 135, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X
% 1.48/1.86     ), T ) ), equivalent( equivalent( Z, Y ), T ) ), U ) ) ) ] )
% 1.48/1.86  , 1, clause( 20981, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 1.48/1.86    , equivalent( equivalent( X, equivalent( Y, Y ) ), Z ) ), T ), equivalent( 
% 1.48/1.86    Z, T ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( Y, Y ) ), :=( Y, Z ), :=( Z, 
% 1.48/1.86    equivalent( equivalent( Y, Y ), Z ) ), :=( T, X ), :=( U, equivalent( X, 
% 1.48/1.86    equivalent( equivalent( equivalent( equivalent( Y, Y ), Z ), Z ), X ) ) )] )
% 1.48/1.86    , substitution( 1, [ :=( X, equivalent( equivalent( Y, Y ), Z ) ), :=( Y
% 1.48/1.86    , Y ), :=( Z, X ), :=( T, equivalent( equivalent( equivalent( equivalent( 
% 1.48/1.86    Y, Y ), Z ), Z ), X ) )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 21106, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), Z ), Z ), X ) ) ) ] )
% 1.48/1.86  , clause( 21626, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), Z ), Z ), X ) ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21628, [ ~( 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( Y, Y ), Z ), Z ), X ) ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 1.48/1.86     ), ~( 'is_a_theorem'( X ) ) ] )
% 1.48/1.86  , 2, clause( 21106, [ 'is_a_theorem'( equivalent( X, equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), Z ), Z ), X ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, equivalent( X, equivalent( equivalent( 
% 1.48/1.86    equivalent( equivalent( Y, Y ), Z ), Z ), X ) ) ), :=( Y, T )] ), 
% 1.48/1.86    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 21182, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( X, equivalent( equivalent( equivalent( equivalent( Y, Y ), Z
% 1.48/1.86     ), Z ), X ) ), T ) ) ) ] )
% 1.48/1.86  , clause( 21628, [ ~( 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( equivalent( equivalent( Y, Y ), Z ), Z ), X ) ), T ) ) ), 
% 1.48/1.86    'is_a_theorem'( T ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21629, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( equivalent( Y, Y ), X ) ), Z ), Z ) ) ] )
% 1.48/1.86  , clause( 21182, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 1.48/1.86    equivalent( X, equivalent( equivalent( equivalent( equivalent( Y, Y ), Z
% 1.48/1.86     ), Z ), X ) ), T ) ) ) ] )
% 1.48/1.86  , 1, clause( 6533, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 1.48/1.86    equivalent( Y, Z ), T ) ), equivalent( equivalent( equivalent( Z, Y ), X
% 1.48/1.86     ), T ) ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [ :=( X, Z ), :=( Y, Y ), :=( Z, X ), :=( T, 
% 1.48/1.86    equivalent( equivalent( equivalent( X, equivalent( equivalent( Y, Y ), X
% 1.48/1.86     ) ), Z ), Z ) )] ), substitution( 1, [ :=( X, Z ), :=( Y, equivalent( 
% 1.48/1.86    equivalent( Y, Y ), X ) ), :=( Z, X ), :=( T, Z )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 21461, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( equivalent( Y, Y ), X ) ), Z ), Z ) ) ] )
% 1.48/1.86  , clause( 21629, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 1.48/1.86    equivalent( equivalent( Y, Y ), X ) ), Z ), Z ) ) ] )
% 1.48/1.86  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 1.48/1.86    permutation( 0, [ ==>( 0, 0 )] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  resolution(
% 1.48/1.86  clause( 21630, [] )
% 1.48/1.86  , clause( 4, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a, 
% 1.48/1.86    equivalent( equivalent( b, b ), a ) ), c ), c ) ) ) ] )
% 1.48/1.86  , 0, clause( 21461, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 1.48/1.86    , equivalent( equivalent( Y, Y ), X ) ), Z ), Z ) ) ] )
% 1.48/1.86  , 0, substitution( 0, [] ), substitution( 1, [ :=( X, a ), :=( Y, b ), :=( 
% 1.48/1.86    Z, c )] )).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  subsumption(
% 1.48/1.86  clause( 21567, [] )
% 1.48/1.86  , clause( 21630, [] )
% 1.48/1.86  , substitution( 0, [] ), permutation( 0, [] ) ).
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  end.
% 1.48/1.86  
% 1.48/1.86  % ABCDEFGHIJKLMNOPQRSTUVWXYZ
% 1.48/1.86  
% 1.48/1.86  Memory use:
% 1.48/1.86  
% 1.48/1.86  space for terms:        565164
% 1.48/1.86  space for clauses:      2349787
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  clauses generated:      73112
% 1.48/1.86  clauses kept:           21568
% 1.48/1.86  clauses selected:       1162
% 1.48/1.86  clauses deleted:        83
% 1.48/1.86  clauses inuse deleted:  4
% 1.48/1.86  
% 1.48/1.86  subsentry:          55036
% 1.48/1.86  literals s-matched: 51629
% 1.48/1.86  literals matched:   51628
% 1.48/1.86  full subsumption:   0
% 1.48/1.86  
% 1.48/1.86  checksum:           1578527923
% 1.48/1.86  
% 1.48/1.86  
% 1.48/1.86  Bliksem ended
%------------------------------------------------------------------------------