TSTP Solution File: LCL097-1 by Bliksem---1.12

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Bliksem---1.12
% Problem  : LCL097-1 : TPTP v8.1.0. Released v1.0.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : bliksem %s

% Computer : n021.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 0.89s 1.33s
% Output   : Refutation 0.89s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.08/0.14  % Problem  : LCL097-1 : TPTP v8.1.0. Released v1.0.0.
% 0.08/0.15  % Command  : bliksem %s
% 0.16/0.37  % Computer : n021.cluster.edu
% 0.16/0.37  % Model    : x86_64 x86_64
% 0.16/0.37  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.16/0.37  % Memory   : 8042.1875MB
% 0.16/0.37  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.16/0.37  % CPULimit : 300
% 0.16/0.37  % DateTime : Mon Jul  4 06:15:46 EDT 2022
% 0.16/0.37  % CPUTime  : 
% 0.89/1.33  *** allocated 10000 integers for termspace/termends
% 0.89/1.33  *** allocated 10000 integers for clauses
% 0.89/1.33  *** allocated 10000 integers for justifications
% 0.89/1.33  Bliksem 1.12
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  Automatic Strategy Selection
% 0.89/1.33  
% 0.89/1.33  Clauses:
% 0.89/1.33  [
% 0.89/1.33     [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), ~( 'is_a_theorem'( X ) ), 
% 0.89/1.33    'is_a_theorem'( Y ) ],
% 0.89/1.33     [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T )
% 0.89/1.33     ) ],
% 0.89/1.33     [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( 
% 0.89/1.33    equivalent( Y, Z ), T ) ), U ), U ) ) ],
% 0.89/1.33     [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( a, 
% 0.89/1.33    b ), c ), e ), equivalent( equivalent( equivalent( a, falsehood ), c ), 
% 0.89/1.33    equivalent( equivalent( b, falsehood ), e ) ) ) ) ) ]
% 0.89/1.33  ] .
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  percentage equality = 0.000000, percentage horn = 1.000000
% 0.89/1.33  This is a near-Horn, non-equality  problem
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  Options Used:
% 0.89/1.33  
% 0.89/1.33  useres =            1
% 0.89/1.33  useparamod =        0
% 0.89/1.33  useeqrefl =         0
% 0.89/1.33  useeqfact =         0
% 0.89/1.33  usefactor =         1
% 0.89/1.33  usesimpsplitting =  0
% 0.89/1.33  usesimpdemod =      0
% 0.89/1.33  usesimpres =        4
% 0.89/1.33  
% 0.89/1.33  resimpinuse      =  1000
% 0.89/1.33  resimpclauses =     20000
% 0.89/1.33  substype =          standard
% 0.89/1.33  backwardsubs =      1
% 0.89/1.33  selectoldest =      5
% 0.89/1.33  
% 0.89/1.33  litorderings [0] =  split
% 0.89/1.33  litorderings [1] =  liftord
% 0.89/1.33  
% 0.89/1.33  termordering =      none
% 0.89/1.33  
% 0.89/1.33  litapriori =        1
% 0.89/1.33  termapriori =       0
% 0.89/1.33  litaposteriori =    0
% 0.89/1.33  termaposteriori =   0
% 0.89/1.33  demodaposteriori =  0
% 0.89/1.33  ordereqreflfact =   0
% 0.89/1.33  
% 0.89/1.33  litselect =         negative
% 0.89/1.33  
% 0.89/1.33  maxweight =         30000
% 0.89/1.33  maxdepth =          30000
% 0.89/1.33  maxlength =         115
% 0.89/1.33  maxnrvars =         195
% 0.89/1.33  excuselevel =       0
% 0.89/1.33  increasemaxweight = 0
% 0.89/1.33  
% 0.89/1.33  maxselected =       10000000
% 0.89/1.33  maxnrclauses =      10000000
% 0.89/1.33  
% 0.89/1.33  showgenerated =    0
% 0.89/1.33  showkept =         0
% 0.89/1.33  showselected =     0
% 0.89/1.33  showdeleted =      0
% 0.89/1.33  showresimp =       1
% 0.89/1.33  showstatus =       2000
% 0.89/1.33  
% 0.89/1.33  prologoutput =     1
% 0.89/1.33  nrgoals =          5000000
% 0.89/1.33  totalproof =       1
% 0.89/1.33  
% 0.89/1.33  Symbols occurring in the translation:
% 0.89/1.33  
% 0.89/1.33  {}  [0, 0]      (w:1, o:2, a:1, s:1, b:0), 
% 0.89/1.33  .  [1, 2]      (w:1, o:25, a:1, s:1, b:0), 
% 0.89/1.33  !  [4, 1]      (w:1, o:19, a:1, s:1, b:0), 
% 0.89/1.33  =  [13, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 0.89/1.33  ==>  [14, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 0.89/1.33  equivalent  [41, 2]      (w:1, o:50, a:1, s:1, b:0), 
% 0.89/1.33  'is_a_theorem'  [42, 1]      (w:1, o:24, a:1, s:1, b:0), 
% 0.89/1.33  a  [46, 0]      (w:1, o:14, a:1, s:1, b:0), 
% 0.89/1.33  b  [47, 0]      (w:1, o:15, a:1, s:1, b:0), 
% 0.89/1.33  c  [48, 0]      (w:1, o:16, a:1, s:1, b:0), 
% 0.89/1.33  e  [49, 0]      (w:1, o:17, a:1, s:1, b:0), 
% 0.89/1.33  falsehood  [50, 0]      (w:1, o:18, a:1, s:1, b:0).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  Starting Search:
% 0.89/1.33  
% 0.89/1.33  Resimplifying inuse:
% 0.89/1.33  Done
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  Intermediate Status:
% 0.89/1.33  Generated:    5696
% 0.89/1.33  Kept:         2054
% 0.89/1.33  Inuse:        282
% 0.89/1.33  Deleted:      2
% 0.89/1.33  Deletedinuse: 2
% 0.89/1.33  
% 0.89/1.33  Resimplifying inuse:
% 0.89/1.33  Done
% 0.89/1.33  
% 0.89/1.33  Resimplifying inuse:
% 0.89/1.33  Done
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  Intermediate Status:
% 0.89/1.33  Generated:    10119
% 0.89/1.33  Kept:         4056
% 0.89/1.33  Inuse:        387
% 0.89/1.33  Deleted:      2
% 0.89/1.33  Deletedinuse: 2
% 0.89/1.33  
% 0.89/1.33  Resimplifying inuse:
% 0.89/1.33  Done
% 0.89/1.33  
% 0.89/1.33  Resimplifying inuse:
% 0.89/1.33  Done
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  Intermediate Status:
% 0.89/1.33  Generated:    15323
% 0.89/1.33  Kept:         6077
% 0.89/1.33  Inuse:        468
% 0.89/1.33  Deleted:      2
% 0.89/1.33  Deletedinuse: 2
% 0.89/1.33  
% 0.89/1.33  Resimplifying inuse:
% 0.89/1.33  Done
% 0.89/1.33  
% 0.89/1.33  Resimplifying inuse:
% 0.89/1.33  Done
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  Intermediate Status:
% 0.89/1.33  Generated:    19173
% 0.89/1.33  Kept:         8085
% 0.89/1.33  Inuse:        532
% 0.89/1.33  Deleted:      2
% 0.89/1.33  Deletedinuse: 2
% 0.89/1.33  
% 0.89/1.33  Resimplifying inuse:
% 0.89/1.33  Done
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  Bliksems!, er is een bewijs:
% 0.89/1.33  % SZS status Unsatisfiable
% 0.89/1.33  % SZS output start Refutation
% 0.89/1.33  
% 0.89/1.33  clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y )
% 0.89/1.33    , ~( 'is_a_theorem'( X ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 1, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T )
% 0.89/1.33     ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( 
% 0.89/1.33    equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 3, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( a, b ), c ), e ), equivalent( equivalent( equivalent( a, 
% 0.89/1.33    falsehood ), c ), equivalent( equivalent( b, falsehood ), e ) ) ) ) ) ]
% 0.89/1.33     )
% 0.89/1.33  .
% 0.89/1.33  clause( 4, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 0.89/1.33     ) ), equivalent( Y, Z ) ), T ), T ), U ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 5, [ 'is_a_theorem'( W ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ), U
% 0.89/1.33     ), W ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 6, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( X
% 0.89/1.33    , Y ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 7, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 0.89/1.33     ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), Z ) )
% 0.89/1.33     ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 8, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 0.89/1.33    X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) )
% 0.89/1.33     ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 14, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 17, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( equivalent( 
% 0.89/1.33    T, Y ), equivalent( equivalent( X, T ), Z ) ) ), U ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 20, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X ), 
% 0.89/1.33    equivalent( Z, Y ) ) ), T ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 23, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 0.89/1.33     ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 45, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    equivalent( Z, equivalent( T, X ) ), equivalent( Z, equivalent( T, Y ) )
% 0.89/1.33     ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 177, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, 
% 0.89/1.33    equivalent( equivalent( equivalent( Z, T ), equivalent( Z, U ) ), W ) ) )
% 0.89/1.33    , equivalent( X, equivalent( Y, equivalent( equivalent( T, U ), W ) ) ) )
% 0.89/1.33     ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 8227, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 0.89/1.33    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 0.89/1.33  .
% 0.89/1.33  clause( 8247, [] )
% 0.89/1.33  .
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  % SZS output end Refutation
% 0.89/1.33  found a proof!
% 0.89/1.33  
% 0.89/1.33  % ABCDEFGHIJKLMNOPQRSTUVWXYZ
% 0.89/1.33  
% 0.89/1.33  initialclauses(
% 0.89/1.33  [ clause( 8249, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), ~( 
% 0.89/1.33    'is_a_theorem'( X ) ), 'is_a_theorem'( Y ) ] )
% 0.89/1.33  , clause( 8250, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 0.89/1.33     ), T ), T ) ) ] )
% 0.89/1.33  , clause( 8251, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 0.89/1.33    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 0.89/1.33  , clause( 8252, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( a, b ), c ), e ), equivalent( equivalent( equivalent( a, 
% 0.89/1.33    falsehood ), c ), equivalent( equivalent( b, falsehood ), e ) ) ) ) ) ]
% 0.89/1.33     )
% 0.89/1.33  ] ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y )
% 0.89/1.33    , ~( 'is_a_theorem'( X ) ) ] )
% 0.89/1.33  , clause( 8249, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), ~( 
% 0.89/1.33    'is_a_theorem'( X ) ), 'is_a_theorem'( Y ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.89/1.33     ), ==>( 1, 2 ), ==>( 2, 1 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 1, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T )
% 0.89/1.33     ) ] )
% 0.89/1.33  , clause( 8250, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 0.89/1.33     ), T ), T ) ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.89/1.33    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( 
% 0.89/1.33    equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 0.89/1.33  , clause( 8251, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 0.89/1.33    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.89/1.33    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 3, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( a, b ), c ), e ), equivalent( equivalent( equivalent( a, 
% 0.89/1.33    falsehood ), c ), equivalent( equivalent( b, falsehood ), e ) ) ) ) ) ]
% 0.89/1.33     )
% 0.89/1.33  , clause( 8252, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( a, b ), c ), e ), equivalent( equivalent( equivalent( a, 
% 0.89/1.33    falsehood ), c ), equivalent( equivalent( b, falsehood ), e ) ) ) ) ) ]
% 0.89/1.33     )
% 0.89/1.33  , substitution( 0, [] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8254, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), 
% 0.89/1.33    equivalent( Y, Z ) ), T ), T ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.89/1.33  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.89/1.33     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.89/1.33  , 2, clause( 1, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 0.89/1.33     ), T ), T ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), equivalent( Y, Z )
% 0.89/1.33     ), T ), T ) ), :=( Y, U )] ), substitution( 1, [ :=( X, X ), :=( Y, Y )
% 0.89/1.33    , :=( Z, Z ), :=( T, T )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 4, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 0.89/1.33     ) ), equivalent( Y, Z ) ), T ), T ), U ) ) ) ] )
% 0.89/1.33  , clause( 8254, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), 
% 0.89/1.33    equivalent( Y, Z ) ), T ), T ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.89/1.33    , U )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8256, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 0.89/1.33     ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ), U ), W ) ) ), 
% 0.89/1.33    'is_a_theorem'( W ) ] )
% 0.89/1.33  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.89/1.33     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.89/1.33  , 2, clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 0.89/1.33    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 0.89/1.33    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ), :=( Y, W )] ), 
% 0.89/1.33    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.89/1.33    , U )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 5, [ 'is_a_theorem'( W ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ), U
% 0.89/1.33     ), W ) ) ) ] )
% 0.89/1.33  , clause( 8256, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 0.89/1.33     ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ), U ), W ) ) ), 
% 0.89/1.33    'is_a_theorem'( W ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.89/1.33    , U ), :=( W, W )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8257, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    X, Y ) ) ) ] )
% 0.89/1.33  , clause( 4, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( X, Z ) ), equivalent( Y, Z ) ), T ), T ), U ) ) ) ] )
% 0.89/1.33  , 1, clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 0.89/1.33    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, Z ), :=( Y, X ), :=( Z, Y ), :=( T, 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Y ) ) ), :=( U, equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Y ) ) )] ), substitution( 1, [ :=( X, 
% 0.89/1.33    Z ), :=( Y, X ), :=( Z, Y ), :=( T, equivalent( X, Y ) ), :=( U, 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Y ) ) )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 6, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( X
% 0.89/1.33    , Y ) ) ) ] )
% 0.89/1.33  , clause( 8257, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( X, Y ) ) ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.89/1.33     )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8258, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 0.89/1.33    , Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), Z
% 0.89/1.33     ) ) ) ) ] )
% 0.89/1.33  , clause( 5, [ 'is_a_theorem'( W ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( equivalent( equivalent( X
% 0.89/1.33    , Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ), 
% 0.89/1.33    U ), U ), W ) ) ) ] )
% 0.89/1.33  , 1, clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 0.89/1.33    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, X ), :=( Y, T ), :=( Z, Y ), :=( T, 
% 0.89/1.33    equivalent( equivalent( X, T ), Z ) ), :=( U, equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), equivalent( 
% 0.89/1.33    equivalent( X, T ), Z ) ) ) ), :=( W, equivalent( equivalent( equivalent( 
% 0.89/1.33    X, Y ), Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T
% 0.89/1.33     ), Z ) ) ) )] ), substitution( 1, [ :=( X, equivalent( X, T ) ), :=( Y, 
% 0.89/1.33    equivalent( X, Y ) ), :=( Z, Z ), :=( T, equivalent( equivalent( T, Y ), 
% 0.89/1.33    equivalent( equivalent( X, T ), Z ) ) ), :=( U, equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), equivalent( 
% 0.89/1.33    equivalent( X, T ), Z ) ) ) )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 7, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 0.89/1.33     ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), Z ) )
% 0.89/1.33     ) ) ] )
% 0.89/1.33  , clause( 8258, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.89/1.33     ), Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), 
% 0.89/1.33    Z ) ) ) ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.89/1.33    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8260, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.89/1.33     ), equivalent( X, Y ) ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 0.89/1.33  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.89/1.33     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.89/1.33  , 2, clause( 6, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( X, Y ) ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    X, Y ) ) ), :=( Y, Z )] ), substitution( 1, [ :=( X, X ), :=( Y, Y )] )
% 0.89/1.33    ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 8, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 0.89/1.33  , clause( 8260, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 0.89/1.33    , Y ), equivalent( X, Y ) ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 0.89/1.33    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8261, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 0.89/1.33    , Z ), T ) ) ) ] )
% 0.89/1.33  , clause( 8, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 0.89/1.33  , 1, clause( 2, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), 
% 0.89/1.33    equivalent( equivalent( Y, Z ), T ) ), U ), U ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( X, Z ) ), T ) ), :=( Y, equivalent( equivalent( Y, Z ), T ) )
% 0.89/1.33    , :=( Z, equivalent( equivalent( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ) )] ), 
% 0.89/1.33    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.89/1.33    , equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, 
% 0.89/1.33    Z ) ), T ), equivalent( equivalent( Y, Z ), T ) ) )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( equivalent( 
% 0.89/1.33    X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y, Z ), T ) )
% 0.89/1.33     ) ] )
% 0.89/1.33  , clause( 8261, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 0.89/1.33    , Z ), T ) ) ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.89/1.33    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8262, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 0.89/1.33  , clause( 8, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 0.89/1.33  , 1, clause( 7, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.89/1.33     ), Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), 
% 0.89/1.33    Z ) ) ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, Z ), :=( Y, Y ), :=( Z, equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( equivalent( Z, X ), equivalent( Z, Y ) )
% 0.89/1.33     ) )] ), substitution( 1, [ :=( X, Z ), :=( Y, Y ), :=( Z, equivalent( Z
% 0.89/1.33    , Y ) ), :=( T, X )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 14, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 0.89/1.33  , clause( 8262, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 0.89/1.33    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8264, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), equivalent( 
% 0.89/1.33    equivalent( X, T ), Z ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.89/1.33  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.89/1.33     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.89/1.33  , 2, clause( 7, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.89/1.33     ), Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), 
% 0.89/1.33    Z ) ) ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 0.89/1.33    Z ), equivalent( equivalent( T, Y ), equivalent( equivalent( X, T ), Z )
% 0.89/1.33     ) ) ), :=( Y, U )] ), substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, 
% 0.89/1.33    Z ), :=( T, T )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 17, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( equivalent( 
% 0.89/1.33    T, Y ), equivalent( equivalent( X, T ), Z ) ) ), U ) ) ) ] )
% 0.89/1.33  , clause( 8264, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), equivalent( 
% 0.89/1.33    equivalent( X, T ), Z ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.89/1.33    , U )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8266, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.89/1.33     ), equivalent( equivalent( Z, X ), equivalent( Z, Y ) ) ), T ) ) ), 
% 0.89/1.33    'is_a_theorem'( T ) ] )
% 0.89/1.33  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.89/1.33     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.89/1.33  , 2, clause( 14, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( equivalent( Z, X ), equivalent( Z, Y ) ) ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    equivalent( Z, X ), equivalent( Z, Y ) ) ) ), :=( Y, T )] ), 
% 0.89/1.33    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 20, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X ), 
% 0.89/1.33    equivalent( Z, Y ) ) ), T ) ) ) ] )
% 0.89/1.33  , clause( 8266, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 0.89/1.33    , Y ), equivalent( equivalent( Z, X ), equivalent( Z, Y ) ) ), T ) ) ), 
% 0.89/1.33    'is_a_theorem'( T ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.89/1.33    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8268, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( 
% 0.89/1.33    equivalent( Y, Z ), T ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.89/1.33  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.89/1.33     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.89/1.33  , 2, clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 0.89/1.33    , Z ), T ) ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 0.89/1.33    , Z ), T ) ) ), :=( Y, U )] ), substitution( 1, [ :=( X, X ), :=( Y, Y )
% 0.89/1.33    , :=( Z, Z ), :=( T, T )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 23, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 0.89/1.33     ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ) ) ) ] )
% 0.89/1.33  , clause( 8268, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( 
% 0.89/1.33    equivalent( Y, Z ), T ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.89/1.33    , U )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8269, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    equivalent( Z, equivalent( T, X ) ), equivalent( Z, equivalent( T, Y ) )
% 0.89/1.33     ) ) ) ] )
% 0.89/1.33  , clause( 20, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( X, Y ), equivalent( equivalent( Z, X ), 
% 0.89/1.33    equivalent( Z, Y ) ) ), T ) ) ) ] )
% 0.89/1.33  , 1, clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), equivalent( X, Z ) ), T ), equivalent( equivalent( Y
% 0.89/1.33    , Z ), T ) ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, equivalent( T, X ) ), :=( Y, equivalent( T, 
% 0.89/1.33    Y ) ), :=( Z, Z ), :=( T, equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    equivalent( Z, equivalent( T, X ) ), equivalent( Z, equivalent( T, Y ) )
% 0.89/1.33     ) ) )] ), substitution( 1, [ :=( X, T ), :=( Y, X ), :=( Z, Y ), :=( T, 
% 0.89/1.33    equivalent( equivalent( Z, equivalent( T, X ) ), equivalent( Z, 
% 0.89/1.33    equivalent( T, Y ) ) ) )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 45, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.89/1.33    equivalent( Z, equivalent( T, X ) ), equivalent( Z, equivalent( T, Y ) )
% 0.89/1.33     ) ) ) ] )
% 0.89/1.33  , clause( 8269, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( equivalent( Z, equivalent( T, X ) ), equivalent( Z, 
% 0.89/1.33    equivalent( T, Y ) ) ) ) ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.89/1.33    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8270, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, 
% 0.89/1.33    equivalent( equivalent( equivalent( Z, T ), equivalent( Z, U ) ), W ) ) )
% 0.89/1.33    , equivalent( X, equivalent( Y, equivalent( equivalent( T, U ), W ) ) ) )
% 0.89/1.33     ) ] )
% 0.89/1.33  , clause( 23, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( equivalent( X, Y ), equivalent( X, Z
% 0.89/1.33     ) ), T ), equivalent( equivalent( Y, Z ), T ) ), U ) ) ) ] )
% 0.89/1.33  , 1, clause( 45, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.89/1.33    equivalent( equivalent( Z, equivalent( T, X ) ), equivalent( Z, 
% 0.89/1.33    equivalent( T, Y ) ) ) ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, Z ), :=( Y, T ), :=( Z, U ), :=( T, W ), 
% 0.89/1.33    :=( U, equivalent( equivalent( X, equivalent( Y, equivalent( equivalent( 
% 0.89/1.33    equivalent( Z, T ), equivalent( Z, U ) ), W ) ) ), equivalent( X, 
% 0.89/1.33    equivalent( Y, equivalent( equivalent( T, U ), W ) ) ) ) )] ), 
% 0.89/1.33    substitution( 1, [ :=( X, equivalent( equivalent( equivalent( Z, T ), 
% 0.89/1.33    equivalent( Z, U ) ), W ) ), :=( Y, equivalent( equivalent( T, U ), W ) )
% 0.89/1.33    , :=( Z, X ), :=( T, Y )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 177, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, 
% 0.89/1.33    equivalent( equivalent( equivalent( Z, T ), equivalent( Z, U ) ), W ) ) )
% 0.89/1.33    , equivalent( X, equivalent( Y, equivalent( equivalent( T, U ), W ) ) ) )
% 0.89/1.33     ) ] )
% 0.89/1.33  , clause( 8270, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y
% 0.89/1.33    , equivalent( equivalent( equivalent( Z, T ), equivalent( Z, U ) ), W ) )
% 0.89/1.33     ), equivalent( X, equivalent( Y, equivalent( equivalent( T, U ), W ) ) )
% 0.89/1.33     ) ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.89/1.33    , U ), :=( W, W )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8271, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 0.89/1.33    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 0.89/1.33  , clause( 17, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.89/1.33    equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( equivalent( 
% 0.89/1.33    T, Y ), equivalent( equivalent( X, T ), Z ) ) ), U ) ) ) ] )
% 0.89/1.33  , 1, clause( 177, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 0.89/1.33    Y, equivalent( equivalent( equivalent( Z, T ), equivalent( Z, U ) ), W )
% 0.89/1.33     ) ), equivalent( X, equivalent( Y, equivalent( equivalent( T, U ), W ) )
% 0.89/1.33     ) ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [ :=( X, equivalent( X, Y ) ), :=( Y, Z ), :=( Z, T )
% 0.89/1.33    , :=( T, equivalent( X, U ) ), :=( U, equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 0.89/1.33    , Z ), equivalent( equivalent( Y, U ), T ) ) ) )] ), substitution( 1, [ 
% 0.89/1.33    :=( X, equivalent( equivalent( equivalent( X, Y ), Z ), T ) ), :=( Y, 
% 0.89/1.33    equivalent( equivalent( X, U ), Z ) ), :=( Z, X ), :=( T, Y ), :=( U, U )
% 0.89/1.33    , :=( W, T )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 8227, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 0.89/1.33    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 0.89/1.33  , clause( 8271, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 0.89/1.33    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 0.89/1.33  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.89/1.33    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  resolution(
% 0.89/1.33  clause( 8272, [] )
% 0.89/1.33  , clause( 3, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( a, b ), c ), e ), equivalent( equivalent( equivalent( a, 
% 0.89/1.33    falsehood ), c ), equivalent( equivalent( b, falsehood ), e ) ) ) ) ) ]
% 0.89/1.33     )
% 0.89/1.33  , 0, clause( 8227, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.89/1.33    equivalent( X, Y ), Z ), T ), equivalent( equivalent( equivalent( X, U )
% 0.89/1.33    , Z ), equivalent( equivalent( Y, U ), T ) ) ) ) ] )
% 0.89/1.33  , 0, substitution( 0, [] ), substitution( 1, [ :=( X, a ), :=( Y, b ), :=( 
% 0.89/1.33    Z, c ), :=( T, e ), :=( U, falsehood )] )).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  subsumption(
% 0.89/1.33  clause( 8247, [] )
% 0.89/1.33  , clause( 8272, [] )
% 0.89/1.33  , substitution( 0, [] ), permutation( 0, [] ) ).
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  end.
% 0.89/1.33  
% 0.89/1.33  % ABCDEFGHIJKLMNOPQRSTUVWXYZ
% 0.89/1.33  
% 0.89/1.33  Memory use:
% 0.89/1.33  
% 0.89/1.33  space for terms:        200657
% 0.89/1.33  space for clauses:      917782
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  clauses generated:      20036
% 0.89/1.33  clauses kept:           8248
% 0.89/1.33  clauses selected:       552
% 0.89/1.33  clauses deleted:        2
% 0.89/1.33  clauses inuse deleted:  2
% 0.89/1.33  
% 0.89/1.33  subsentry:          12678
% 0.89/1.33  literals s-matched: 11790
% 0.89/1.33  literals matched:   11790
% 0.89/1.33  full subsumption:   0
% 0.89/1.33  
% 0.89/1.33  checksum:           1267434046
% 0.89/1.33  
% 0.89/1.33  
% 0.89/1.33  Bliksem ended
%------------------------------------------------------------------------------