TSTP Solution File: LCL123-1 by Bliksem---1.12

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Bliksem---1.12
% Problem  : LCL123-1 : TPTP v8.1.0. Bugfixed v2.3.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : bliksem %s

% Computer : n015.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 07:50:40 EDT 2022

% Result   : Unsatisfiable 0.43s 1.17s
% Output   : Refutation 0.43s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.10/0.12  % Problem  : LCL123-1 : TPTP v8.1.0. Bugfixed v2.3.0.
% 0.10/0.13  % Command  : bliksem %s
% 0.13/0.34  % Computer : n015.cluster.edu
% 0.13/0.34  % Model    : x86_64 x86_64
% 0.13/0.34  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.13/0.34  % Memory   : 8042.1875MB
% 0.13/0.34  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.13/0.34  % CPULimit : 300
% 0.13/0.34  % DateTime : Sat Jul  2 14:14:44 EDT 2022
% 0.13/0.34  % CPUTime  : 
% 0.43/1.17  *** allocated 10000 integers for termspace/termends
% 0.43/1.17  *** allocated 10000 integers for clauses
% 0.43/1.17  *** allocated 10000 integers for justifications
% 0.43/1.17  Bliksem 1.12
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  Automatic Strategy Selection
% 0.43/1.17  
% 0.43/1.17  Clauses:
% 0.43/1.17  [
% 0.43/1.17     [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), ~( 'is_a_theorem'( X ) ), 
% 0.43/1.17    'is_a_theorem'( Y ) ],
% 0.43/1.17     [ 'is_a_theorem'( equivalent( X, equivalent( X, equivalent( equivalent( 
% 0.43/1.17    Y, Z ), equivalent( equivalent( Y, T ), equivalent( Z, T ) ) ) ) ) ) ]
% 0.43/1.17    ,
% 0.43/1.17     [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a, equivalent( 
% 0.43/1.17    b, c ) ), equivalent( e, equivalent( b, f ) ) ), equivalent( a, 
% 0.43/1.17    equivalent( e, equivalent( c, f ) ) ) ) ) ) ]
% 0.43/1.17  ] .
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  percentage equality = 0.000000, percentage horn = 1.000000
% 0.43/1.17  This is a near-Horn, non-equality  problem
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  Options Used:
% 0.43/1.17  
% 0.43/1.17  useres =            1
% 0.43/1.17  useparamod =        0
% 0.43/1.17  useeqrefl =         0
% 0.43/1.17  useeqfact =         0
% 0.43/1.17  usefactor =         1
% 0.43/1.17  usesimpsplitting =  0
% 0.43/1.17  usesimpdemod =      0
% 0.43/1.17  usesimpres =        4
% 0.43/1.17  
% 0.43/1.17  resimpinuse      =  1000
% 0.43/1.17  resimpclauses =     20000
% 0.43/1.17  substype =          standard
% 0.43/1.17  backwardsubs =      1
% 0.43/1.17  selectoldest =      5
% 0.43/1.17  
% 0.43/1.17  litorderings [0] =  split
% 0.43/1.17  litorderings [1] =  liftord
% 0.43/1.17  
% 0.43/1.17  termordering =      none
% 0.43/1.17  
% 0.43/1.17  litapriori =        1
% 0.43/1.17  termapriori =       0
% 0.43/1.17  litaposteriori =    0
% 0.43/1.17  termaposteriori =   0
% 0.43/1.17  demodaposteriori =  0
% 0.43/1.17  ordereqreflfact =   0
% 0.43/1.17  
% 0.43/1.17  litselect =         negative
% 0.43/1.17  
% 0.43/1.17  maxweight =         30000
% 0.43/1.17  maxdepth =          30000
% 0.43/1.17  maxlength =         115
% 0.43/1.17  maxnrvars =         195
% 0.43/1.17  excuselevel =       0
% 0.43/1.17  increasemaxweight = 0
% 0.43/1.17  
% 0.43/1.17  maxselected =       10000000
% 0.43/1.17  maxnrclauses =      10000000
% 0.43/1.17  
% 0.43/1.17  showgenerated =    0
% 0.43/1.17  showkept =         0
% 0.43/1.17  showselected =     0
% 0.43/1.17  showdeleted =      0
% 0.43/1.17  showresimp =       1
% 0.43/1.17  showstatus =       2000
% 0.43/1.17  
% 0.43/1.17  prologoutput =     1
% 0.43/1.17  nrgoals =          5000000
% 0.43/1.17  totalproof =       1
% 0.43/1.17  
% 0.43/1.17  Symbols occurring in the translation:
% 0.43/1.17  
% 0.43/1.17  {}  [0, 0]      (w:1, o:2, a:1, s:1, b:0), 
% 0.43/1.17  .  [1, 2]      (w:1, o:24, a:1, s:1, b:0), 
% 0.43/1.17  !  [4, 1]      (w:1, o:18, a:1, s:1, b:0), 
% 0.43/1.17  =  [13, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 0.43/1.17  ==>  [14, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 0.43/1.17  equivalent  [41, 2]      (w:1, o:49, a:1, s:1, b:0), 
% 0.43/1.17  'is_a_theorem'  [42, 1]      (w:1, o:23, a:1, s:1, b:0), 
% 0.43/1.17  a  [45, 0]      (w:1, o:13, a:1, s:1, b:0), 
% 0.43/1.17  b  [46, 0]      (w:1, o:14, a:1, s:1, b:0), 
% 0.43/1.17  c  [47, 0]      (w:1, o:15, a:1, s:1, b:0), 
% 0.43/1.17  e  [48, 0]      (w:1, o:16, a:1, s:1, b:0), 
% 0.43/1.17  f  [49, 0]      (w:1, o:17, a:1, s:1, b:0).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  Starting Search:
% 0.43/1.17  
% 0.43/1.17  Resimplifying inuse:
% 0.43/1.17  Done
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  Intermediate Status:
% 0.43/1.17  Generated:    4666
% 0.43/1.17  Kept:         2004
% 0.43/1.17  Inuse:        275
% 0.43/1.17  Deleted:      5
% 0.43/1.17  Deletedinuse: 2
% 0.43/1.17  
% 0.43/1.17  Resimplifying inuse:
% 0.43/1.17  Done
% 0.43/1.17  
% 0.43/1.17  Resimplifying inuse:
% 0.43/1.17  
% 0.43/1.17  Bliksems!, er is een bewijs:
% 0.43/1.17  % SZS status Unsatisfiable
% 0.43/1.17  % SZS output start Refutation
% 0.43/1.17  
% 0.43/1.17  clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y )
% 0.43/1.17    , ~( 'is_a_theorem'( X ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 1, [ 'is_a_theorem'( equivalent( X, equivalent( X, equivalent( 
% 0.43/1.17    equivalent( Y, Z ), equivalent( equivalent( Y, T ), equivalent( Z, T ) )
% 0.43/1.17     ) ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 2, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a, 
% 0.43/1.17    equivalent( b, c ) ), equivalent( e, equivalent( b, f ) ) ), equivalent( 
% 0.43/1.17    a, equivalent( e, equivalent( c, f ) ) ) ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 3, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.43/1.17    X, equivalent( X, equivalent( equivalent( Y, Z ), equivalent( equivalent( 
% 0.43/1.17    Y, T ), equivalent( Z, T ) ) ) ) ), U ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 4, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( X, 
% 0.43/1.17    equivalent( equivalent( Y, Z ), equivalent( equivalent( Y, T ), 
% 0.43/1.17    equivalent( Z, T ) ) ) ) ), equivalent( equivalent( U, W ), equivalent( 
% 0.43/1.17    equivalent( U, V0 ), equivalent( W, V0 ) ) ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 5, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.43/1.17    equivalent( X, Z ), equivalent( Y, Z ) ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 6, [ 'is_a_theorem'( V1 ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( equivalent( X, equivalent( X, equivalent( equivalent( Y, Z )
% 0.43/1.17    , equivalent( equivalent( Y, T ), equivalent( Z, T ) ) ) ) ), equivalent( 
% 0.43/1.17    equivalent( U, W ), equivalent( equivalent( U, V0 ), equivalent( W, V0 )
% 0.43/1.17     ) ) ), V1 ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 8, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.43/1.17    equivalent( X, Y ), equivalent( equivalent( X, Z ), equivalent( Y, Z ) )
% 0.43/1.17     ), T ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 0.43/1.17     ), equivalent( equivalent( equivalent( X, T ), equivalent( Y, T ) ), Z )
% 0.43/1.17     ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 11, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 0.43/1.17    equivalent( Z, Y ) ), equivalent( equivalent( X, T ), equivalent( Z, T )
% 0.43/1.17     ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 14, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), 
% 0.43/1.17    equivalent( equivalent( X, T ), equivalent( Z, T ) ) ), U ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 19, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.17    equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U ), equivalent( 
% 0.43/1.17    equivalent( X, equivalent( Y, T ) ), U ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 23, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, Z )
% 0.43/1.17     ), equivalent( equivalent( X, T ), equivalent( equivalent( equivalent( Y
% 0.43/1.17    , U ), equivalent( Z, U ) ), T ) ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 27, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 0.43/1.17     ), equivalent( equivalent( equivalent( equivalent( X, T ), U ), 
% 0.43/1.17    equivalent( equivalent( Y, T ), U ) ), Z ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 31, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.17    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), Z ) ), 
% 0.43/1.17    equivalent( equivalent( X, U ), equivalent( T, U ) ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 36, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( X
% 0.43/1.17    , Y ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 43, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 45, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, Z )
% 0.43/1.17     ), equivalent( X, equivalent( equivalent( Y, T ), equivalent( Z, T ) ) )
% 0.43/1.17     ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 47, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 0.43/1.17    equivalent( Z, Y ) ), equivalent( X, Z ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 51, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), 
% 0.43/1.17    equivalent( X, Z ) ), T ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 70, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 0.43/1.17    equivalent( Z, Y ) ), equivalent( equivalent( equivalent( X, T ), U ), 
% 0.43/1.17    equivalent( equivalent( Z, T ), U ) ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 84, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.17    equivalent( Y, Z ) ), equivalent( T, Y ) ), equivalent( X, equivalent( T
% 0.43/1.17    , Z ) ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 89, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( equivalent( equivalent( X, equivalent( Y, Z ) ), equivalent( 
% 0.43/1.17    T, Y ) ), equivalent( X, equivalent( T, Z ) ) ), U ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 101, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.17    equivalent( X, equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U
% 0.43/1.17     ), W ), equivalent( equivalent( equivalent( X, equivalent( Y, T ) ), U )
% 0.43/1.17    , W ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 2876, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.17    equivalent( Y, Z ) ), equivalent( T, equivalent( Y, U ) ) ), equivalent( 
% 0.43/1.17    X, equivalent( T, equivalent( Z, U ) ) ) ) ) ] )
% 0.43/1.17  .
% 0.43/1.17  clause( 3116, [] )
% 0.43/1.17  .
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  % SZS output end Refutation
% 0.43/1.17  found a proof!
% 0.43/1.17  
% 0.43/1.17  % ABCDEFGHIJKLMNOPQRSTUVWXYZ
% 0.43/1.17  
% 0.43/1.17  initialclauses(
% 0.43/1.17  [ clause( 3118, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), ~( 
% 0.43/1.17    'is_a_theorem'( X ) ), 'is_a_theorem'( Y ) ] )
% 0.43/1.17  , clause( 3119, [ 'is_a_theorem'( equivalent( X, equivalent( X, equivalent( 
% 0.43/1.17    equivalent( Y, Z ), equivalent( equivalent( Y, T ), equivalent( Z, T ) )
% 0.43/1.17     ) ) ) ) ] )
% 0.43/1.17  , clause( 3120, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a
% 0.43/1.17    , equivalent( b, c ) ), equivalent( e, equivalent( b, f ) ) ), equivalent( 
% 0.43/1.17    a, equivalent( e, equivalent( c, f ) ) ) ) ) ) ] )
% 0.43/1.17  ] ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y )
% 0.43/1.17    , ~( 'is_a_theorem'( X ) ) ] )
% 0.43/1.17  , clause( 3118, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), ~( 
% 0.43/1.17    'is_a_theorem'( X ) ), 'is_a_theorem'( Y ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.43/1.17     ), ==>( 1, 2 ), ==>( 2, 1 )] ) ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 1, [ 'is_a_theorem'( equivalent( X, equivalent( X, equivalent( 
% 0.43/1.17    equivalent( Y, Z ), equivalent( equivalent( Y, T ), equivalent( Z, T ) )
% 0.43/1.17     ) ) ) ) ] )
% 0.43/1.17  , clause( 3119, [ 'is_a_theorem'( equivalent( X, equivalent( X, equivalent( 
% 0.43/1.17    equivalent( Y, Z ), equivalent( equivalent( Y, T ), equivalent( Z, T ) )
% 0.43/1.17     ) ) ) ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.43/1.17    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 2, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a, 
% 0.43/1.17    equivalent( b, c ) ), equivalent( e, equivalent( b, f ) ) ), equivalent( 
% 0.43/1.17    a, equivalent( e, equivalent( c, f ) ) ) ) ) ) ] )
% 0.43/1.17  , clause( 3120, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a
% 0.43/1.17    , equivalent( b, c ) ), equivalent( e, equivalent( b, f ) ) ), equivalent( 
% 0.43/1.17    a, equivalent( e, equivalent( c, f ) ) ) ) ) ) ] )
% 0.43/1.17  , substitution( 0, [] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  resolution(
% 0.43/1.17  clause( 3122, [ ~( 'is_a_theorem'( equivalent( equivalent( X, equivalent( X
% 0.43/1.17    , equivalent( equivalent( Y, Z ), equivalent( equivalent( Y, T ), 
% 0.43/1.17    equivalent( Z, T ) ) ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.43/1.17  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.43/1.17     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.43/1.17  , 2, clause( 1, [ 'is_a_theorem'( equivalent( X, equivalent( X, equivalent( 
% 0.43/1.17    equivalent( Y, Z ), equivalent( equivalent( Y, T ), equivalent( Z, T ) )
% 0.43/1.17     ) ) ) ) ] )
% 0.43/1.17  , 0, substitution( 0, [ :=( X, equivalent( X, equivalent( X, equivalent( 
% 0.43/1.17    equivalent( Y, Z ), equivalent( equivalent( Y, T ), equivalent( Z, T ) )
% 0.43/1.17     ) ) ) ), :=( Y, U )] ), substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z
% 0.43/1.17    , Z ), :=( T, T )] )).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 3, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.43/1.17    X, equivalent( X, equivalent( equivalent( Y, Z ), equivalent( equivalent( 
% 0.43/1.17    Y, T ), equivalent( Z, T ) ) ) ) ), U ) ) ) ] )
% 0.43/1.17  , clause( 3122, [ ~( 'is_a_theorem'( equivalent( equivalent( X, equivalent( 
% 0.43/1.17    X, equivalent( equivalent( Y, Z ), equivalent( equivalent( Y, T ), 
% 0.43/1.17    equivalent( Z, T ) ) ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.17    , U )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  resolution(
% 0.43/1.17  clause( 3123, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( X, 
% 0.43/1.17    equivalent( equivalent( Y, Z ), equivalent( equivalent( Y, T ), 
% 0.43/1.17    equivalent( Z, T ) ) ) ) ), equivalent( equivalent( U, W ), equivalent( 
% 0.43/1.17    equivalent( U, V0 ), equivalent( W, V0 ) ) ) ) ) ] )
% 0.43/1.17  , clause( 3, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( X, equivalent( X, equivalent( equivalent( Y, Z ), equivalent( 
% 0.43/1.17    equivalent( Y, T ), equivalent( Z, T ) ) ) ) ), U ) ) ) ] )
% 0.43/1.17  , 1, clause( 1, [ 'is_a_theorem'( equivalent( X, equivalent( X, equivalent( 
% 0.43/1.17    equivalent( Y, Z ), equivalent( equivalent( Y, T ), equivalent( Z, T ) )
% 0.43/1.17     ) ) ) ) ] )
% 0.43/1.17  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), 
% 0.43/1.17    :=( U, equivalent( equivalent( X, equivalent( X, equivalent( equivalent( 
% 0.43/1.17    Y, Z ), equivalent( equivalent( Y, T ), equivalent( Z, T ) ) ) ) ), 
% 0.43/1.17    equivalent( equivalent( U, W ), equivalent( equivalent( U, V0 ), 
% 0.43/1.17    equivalent( W, V0 ) ) ) ) )] ), substitution( 1, [ :=( X, equivalent( X, 
% 0.43/1.17    equivalent( X, equivalent( equivalent( Y, Z ), equivalent( equivalent( Y
% 0.43/1.17    , T ), equivalent( Z, T ) ) ) ) ) ), :=( Y, U ), :=( Z, W ), :=( T, V0 )] )
% 0.43/1.17    ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 4, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( X, 
% 0.43/1.17    equivalent( equivalent( Y, Z ), equivalent( equivalent( Y, T ), 
% 0.43/1.17    equivalent( Z, T ) ) ) ) ), equivalent( equivalent( U, W ), equivalent( 
% 0.43/1.17    equivalent( U, V0 ), equivalent( W, V0 ) ) ) ) ) ] )
% 0.43/1.17  , clause( 3123, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( X
% 0.43/1.17    , equivalent( equivalent( Y, Z ), equivalent( equivalent( Y, T ), 
% 0.43/1.17    equivalent( Z, T ) ) ) ) ), equivalent( equivalent( U, W ), equivalent( 
% 0.43/1.17    equivalent( U, V0 ), equivalent( W, V0 ) ) ) ) ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.17    , U ), :=( W, W ), :=( V0, V0 )] ), permutation( 0, [ ==>( 0, 0 )] )
% 0.43/1.17     ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  resolution(
% 0.43/1.17  clause( 3124, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.43/1.17    equivalent( X, Z ), equivalent( Y, Z ) ) ) ) ] )
% 0.43/1.17  , clause( 3, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( X, equivalent( X, equivalent( equivalent( Y, Z ), equivalent( 
% 0.43/1.17    equivalent( Y, T ), equivalent( Z, T ) ) ) ) ), U ) ) ) ] )
% 0.43/1.17  , 1, clause( 4, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( X
% 0.43/1.17    , equivalent( equivalent( Y, Z ), equivalent( equivalent( Y, T ), 
% 0.43/1.17    equivalent( Z, T ) ) ) ) ), equivalent( equivalent( U, W ), equivalent( 
% 0.43/1.17    equivalent( U, V0 ), equivalent( W, V0 ) ) ) ) ) ] )
% 0.43/1.17  , 0, substitution( 0, [ :=( X, T ), :=( Y, U ), :=( Z, W ), :=( T, V0 ), 
% 0.43/1.17    :=( U, equivalent( equivalent( X, Y ), equivalent( equivalent( X, Z ), 
% 0.43/1.17    equivalent( Y, Z ) ) ) )] ), substitution( 1, [ :=( X, T ), :=( Y, U ), 
% 0.43/1.17    :=( Z, W ), :=( T, V0 ), :=( U, X ), :=( W, Y ), :=( V0, Z )] )).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 5, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.43/1.17    equivalent( X, Z ), equivalent( Y, Z ) ) ) ) ] )
% 0.43/1.17  , clause( 3124, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.43/1.17    equivalent( equivalent( X, Z ), equivalent( Y, Z ) ) ) ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 0.43/1.17    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  resolution(
% 0.43/1.17  clause( 3126, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.17    equivalent( X, equivalent( equivalent( Y, Z ), equivalent( equivalent( Y
% 0.43/1.17    , T ), equivalent( Z, T ) ) ) ) ), equivalent( equivalent( U, W ), 
% 0.43/1.17    equivalent( equivalent( U, V0 ), equivalent( W, V0 ) ) ) ), V1 ) ) ), 
% 0.43/1.17    'is_a_theorem'( V1 ) ] )
% 0.43/1.17  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.43/1.17     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.43/1.17  , 2, clause( 4, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( X
% 0.43/1.17    , equivalent( equivalent( Y, Z ), equivalent( equivalent( Y, T ), 
% 0.43/1.17    equivalent( Z, T ) ) ) ) ), equivalent( equivalent( U, W ), equivalent( 
% 0.43/1.17    equivalent( U, V0 ), equivalent( W, V0 ) ) ) ) ) ] )
% 0.43/1.17  , 0, substitution( 0, [ :=( X, equivalent( equivalent( X, equivalent( X, 
% 0.43/1.17    equivalent( equivalent( Y, Z ), equivalent( equivalent( Y, T ), 
% 0.43/1.17    equivalent( Z, T ) ) ) ) ), equivalent( equivalent( U, W ), equivalent( 
% 0.43/1.17    equivalent( U, V0 ), equivalent( W, V0 ) ) ) ) ), :=( Y, V1 )] ), 
% 0.43/1.17    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.17    , U ), :=( W, W ), :=( V0, V0 )] )).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 6, [ 'is_a_theorem'( V1 ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( equivalent( X, equivalent( X, equivalent( equivalent( Y, Z )
% 0.43/1.17    , equivalent( equivalent( Y, T ), equivalent( Z, T ) ) ) ) ), equivalent( 
% 0.43/1.17    equivalent( U, W ), equivalent( equivalent( U, V0 ), equivalent( W, V0 )
% 0.43/1.17     ) ) ), V1 ) ) ) ] )
% 0.43/1.17  , clause( 3126, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 0.43/1.17    , equivalent( X, equivalent( equivalent( Y, Z ), equivalent( equivalent( 
% 0.43/1.17    Y, T ), equivalent( Z, T ) ) ) ) ), equivalent( equivalent( U, W ), 
% 0.43/1.17    equivalent( equivalent( U, V0 ), equivalent( W, V0 ) ) ) ), V1 ) ) ), 
% 0.43/1.17    'is_a_theorem'( V1 ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.17    , U ), :=( W, W ), :=( V0, V0 ), :=( V1, V1 )] ), permutation( 0, [ ==>( 
% 0.43/1.17    0, 1 ), ==>( 1, 0 )] ) ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  resolution(
% 0.43/1.17  clause( 3128, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.17     ), equivalent( equivalent( X, Z ), equivalent( Y, Z ) ) ), T ) ) ), 
% 0.43/1.17    'is_a_theorem'( T ) ] )
% 0.43/1.17  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.43/1.17     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.43/1.17  , 2, clause( 5, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.43/1.17    equivalent( equivalent( X, Z ), equivalent( Y, Z ) ) ) ) ] )
% 0.43/1.17  , 0, substitution( 0, [ :=( X, equivalent( equivalent( X, Y ), equivalent( 
% 0.43/1.17    equivalent( X, Z ), equivalent( Y, Z ) ) ) ), :=( Y, T )] ), 
% 0.43/1.17    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 8, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( equivalent( 
% 0.43/1.17    equivalent( X, Y ), equivalent( equivalent( X, Z ), equivalent( Y, Z ) )
% 0.43/1.17     ), T ) ) ) ] )
% 0.43/1.17  , clause( 3128, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 0.43/1.17    , Y ), equivalent( equivalent( X, Z ), equivalent( Y, Z ) ) ), T ) ) ), 
% 0.43/1.17    'is_a_theorem'( T ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.43/1.17    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  resolution(
% 0.43/1.17  clause( 3129, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 0.43/1.17    , Z ), equivalent( equivalent( equivalent( X, T ), equivalent( Y, T ) ), 
% 0.43/1.17    Z ) ) ) ] )
% 0.43/1.17  , clause( 8, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( equivalent( X, Y ), equivalent( equivalent( X, Z ), 
% 0.43/1.17    equivalent( Y, Z ) ) ), T ) ) ) ] )
% 0.43/1.17  , 1, clause( 5, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.43/1.17    equivalent( equivalent( X, Z ), equivalent( Y, Z ) ) ) ) ] )
% 0.43/1.17  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, T ), :=( T, 
% 0.43/1.17    equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( equivalent( 
% 0.43/1.17    equivalent( X, T ), equivalent( Y, T ) ), Z ) ) )] ), substitution( 1, [ 
% 0.43/1.17    :=( X, equivalent( X, Y ) ), :=( Y, equivalent( equivalent( X, T ), 
% 0.43/1.17    equivalent( Y, T ) ) ), :=( Z, Z )] )).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 0.43/1.17     ), equivalent( equivalent( equivalent( X, T ), equivalent( Y, T ) ), Z )
% 0.43/1.17     ) ) ] )
% 0.43/1.17  , clause( 3129, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.17     ), Z ), equivalent( equivalent( equivalent( X, T ), equivalent( Y, T ) )
% 0.43/1.17    , Z ) ) ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.43/1.17    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  resolution(
% 0.43/1.17  clause( 3130, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 0.43/1.17    , equivalent( Z, Y ) ), equivalent( equivalent( X, T ), equivalent( Z, T
% 0.43/1.17     ) ) ) ) ] )
% 0.43/1.17  , clause( 8, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( equivalent( X, Y ), equivalent( equivalent( X, Z ), 
% 0.43/1.17    equivalent( Y, Z ) ) ), T ) ) ) ] )
% 0.43/1.17  , 1, clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.17     ), Z ), equivalent( equivalent( equivalent( X, T ), equivalent( Y, T ) )
% 0.43/1.17    , Z ) ) ) ] )
% 0.43/1.17  , 0, substitution( 0, [ :=( X, X ), :=( Y, Z ), :=( Z, T ), :=( T, 
% 0.43/1.17    equivalent( equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), 
% 0.43/1.17    equivalent( equivalent( X, T ), equivalent( Z, T ) ) ) )] ), 
% 0.43/1.17    substitution( 1, [ :=( X, X ), :=( Y, Z ), :=( Z, equivalent( equivalent( 
% 0.43/1.17    X, T ), equivalent( Z, T ) ) ), :=( T, Y )] )).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 11, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 0.43/1.17    equivalent( Z, Y ) ), equivalent( equivalent( X, T ), equivalent( Z, T )
% 0.43/1.17     ) ) ) ] )
% 0.43/1.17  , clause( 3130, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.17     ), equivalent( Z, Y ) ), equivalent( equivalent( X, T ), equivalent( Z, 
% 0.43/1.17    T ) ) ) ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.43/1.17    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  resolution(
% 0.43/1.17  clause( 3132, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.17    equivalent( X, Y ), equivalent( Z, Y ) ), equivalent( equivalent( X, T )
% 0.43/1.17    , equivalent( Z, T ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.43/1.17  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.43/1.17     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.43/1.17  , 2, clause( 11, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.17     ), equivalent( Z, Y ) ), equivalent( equivalent( X, T ), equivalent( Z, 
% 0.43/1.17    T ) ) ) ) ] )
% 0.43/1.17  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 0.43/1.17    equivalent( Z, Y ) ), equivalent( equivalent( X, T ), equivalent( Z, T )
% 0.43/1.17     ) ) ), :=( Y, U )] ), substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, 
% 0.43/1.17    Z ), :=( T, T )] )).
% 0.43/1.17  
% 0.43/1.17  
% 0.43/1.17  subsumption(
% 0.43/1.17  clause( 14, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.17    equivalent( equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), 
% 0.43/1.17    equivalent( equivalent( X, T ), equivalent( Z, T ) ) ), U ) ) ) ] )
% 0.43/1.17  , clause( 3132, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.17    equivalent( X, Y ), equivalent( Z, Y ) ), equivalent( equivalent( X, T )
% 0.43/1.17    , equivalent( Z, T ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.43/1.17  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.18    , U )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3133, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U ), equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, T ) ), U ) ) ) ] )
% 0.43/1.18  , clause( 6, [ 'is_a_theorem'( V1 ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( X, equivalent( X, equivalent( equivalent( Y, Z )
% 0.43/1.18    , equivalent( equivalent( Y, T ), equivalent( Z, T ) ) ) ) ), equivalent( 
% 0.43/1.18    equivalent( U, W ), equivalent( equivalent( U, V0 ), equivalent( W, V0 )
% 0.43/1.18     ) ) ), V1 ) ) ) ] )
% 0.43/1.18  , 1, clause( 11, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.18     ), equivalent( Z, Y ) ), equivalent( equivalent( X, T ), equivalent( Z, 
% 0.43/1.18    T ) ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, equivalent( X, equivalent( equivalent( Y, Z
% 0.43/1.18     ), equivalent( T, Z ) ) ) ), :=( Y, Y ), :=( Z, T ), :=( T, Z ), :=( U, 
% 0.43/1.18    X ), :=( W, equivalent( Y, T ) ), :=( V0, equivalent( equivalent( Y, Z )
% 0.43/1.18    , equivalent( T, Z ) ) ), :=( V1, equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U ), equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, T ) ), U ) ) )] ), substitution( 1, [ :=( X
% 0.43/1.18    , equivalent( X, equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ) )
% 0.43/1.18    , :=( Y, equivalent( equivalent( X, equivalent( equivalent( Y, Z ), 
% 0.43/1.18    equivalent( T, Z ) ) ), equivalent( equivalent( Y, T ), equivalent( 
% 0.43/1.18    equivalent( Y, Z ), equivalent( T, Z ) ) ) ) ), :=( Z, equivalent( X, 
% 0.43/1.18    equivalent( Y, T ) ) ), :=( T, U )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 19, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U ), equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, T ) ), U ) ) ) ] )
% 0.43/1.18  , clause( 3133, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U ), equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, T ) ), U ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.18    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3134, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, Z
% 0.43/1.18     ) ), equivalent( equivalent( X, T ), equivalent( equivalent( equivalent( 
% 0.43/1.18    Y, U ), equivalent( Z, U ) ), T ) ) ) ) ] )
% 0.43/1.18  , clause( 8, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( X, Y ), equivalent( equivalent( X, Z ), 
% 0.43/1.18    equivalent( Y, Z ) ) ), T ) ) ) ] )
% 0.43/1.18  , 1, clause( 19, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U ), equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, T ) ), U ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, X ), :=( Y, equivalent( equivalent( Y, U ), 
% 0.43/1.18    equivalent( Z, U ) ) ), :=( Z, T ), :=( T, equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( equivalent( X, T ), equivalent( 
% 0.43/1.18    equivalent( equivalent( Y, U ), equivalent( Z, U ) ), T ) ) ) )] ), 
% 0.43/1.18    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, U ), :=( T, Z ), :=( U
% 0.43/1.18    , equivalent( equivalent( X, T ), equivalent( equivalent( equivalent( Y, 
% 0.43/1.18    U ), equivalent( Z, U ) ), T ) ) )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 23, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, Z )
% 0.43/1.18     ), equivalent( equivalent( X, T ), equivalent( equivalent( equivalent( Y
% 0.43/1.18    , U ), equivalent( Z, U ) ), T ) ) ) ) ] )
% 0.43/1.18  , clause( 3134, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y
% 0.43/1.18    , Z ) ), equivalent( equivalent( X, T ), equivalent( equivalent( 
% 0.43/1.18    equivalent( Y, U ), equivalent( Z, U ) ), T ) ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.18    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3135, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 0.43/1.18    , Z ), equivalent( equivalent( equivalent( equivalent( X, T ), U ), 
% 0.43/1.18    equivalent( equivalent( Y, T ), U ) ), Z ) ) ) ] )
% 0.43/1.18  , clause( 8, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( X, Y ), equivalent( equivalent( X, Z ), 
% 0.43/1.18    equivalent( Y, Z ) ) ), T ) ) ) ] )
% 0.43/1.18  , 1, clause( 23, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y
% 0.43/1.18    , Z ) ), equivalent( equivalent( X, T ), equivalent( equivalent( 
% 0.43/1.18    equivalent( Y, U ), equivalent( Z, U ) ), T ) ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, T ), :=( T, 
% 0.43/1.18    equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( equivalent( 
% 0.43/1.18    equivalent( equivalent( X, T ), U ), equivalent( equivalent( Y, T ), U )
% 0.43/1.18     ), Z ) ) )] ), substitution( 1, [ :=( X, equivalent( X, Y ) ), :=( Y, 
% 0.43/1.18    equivalent( X, T ) ), :=( Z, equivalent( Y, T ) ), :=( T, Z ), :=( U, U )] )
% 0.43/1.18    ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 27, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), Z
% 0.43/1.18     ), equivalent( equivalent( equivalent( equivalent( X, T ), U ), 
% 0.43/1.18    equivalent( equivalent( Y, T ), U ) ), Z ) ) ) ] )
% 0.43/1.18  , clause( 3135, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.18     ), Z ), equivalent( equivalent( equivalent( equivalent( X, T ), U ), 
% 0.43/1.18    equivalent( equivalent( Y, T ), U ) ), Z ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.18    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3136, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), Z ) ), 
% 0.43/1.18    equivalent( equivalent( X, U ), equivalent( T, U ) ) ) ) ] )
% 0.43/1.18  , clause( 8, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( X, Y ), equivalent( equivalent( X, Z ), 
% 0.43/1.18    equivalent( Y, Z ) ) ), T ) ) ) ] )
% 0.43/1.18  , 1, clause( 27, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.18     ), Z ), equivalent( equivalent( equivalent( equivalent( X, T ), U ), 
% 0.43/1.18    equivalent( equivalent( Y, T ), U ) ), Z ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, X ), :=( Y, T ), :=( Z, U ), :=( T, 
% 0.43/1.18    equivalent( equivalent( equivalent( equivalent( X, Y ), Z ), equivalent( 
% 0.43/1.18    equivalent( T, Y ), Z ) ), equivalent( equivalent( X, U ), equivalent( T
% 0.43/1.18    , U ) ) ) )] ), substitution( 1, [ :=( X, X ), :=( Y, T ), :=( Z, 
% 0.43/1.18    equivalent( equivalent( X, U ), equivalent( T, U ) ) ), :=( T, Y ), :=( U
% 0.43/1.18    , Z )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 31, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), Z ) ), 
% 0.43/1.18    equivalent( equivalent( X, U ), equivalent( T, U ) ) ) ) ] )
% 0.43/1.18  , clause( 3136, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), Z ) ), 
% 0.43/1.18    equivalent( equivalent( X, U ), equivalent( T, U ) ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.18    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3137, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( 
% 0.43/1.18    X, Y ) ) ) ] )
% 0.43/1.18  , clause( 14, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), 
% 0.43/1.18    equivalent( equivalent( X, T ), equivalent( Z, T ) ) ), U ) ) ) ] )
% 0.43/1.18  , 1, clause( 31, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, Y ), Z ), equivalent( equivalent( T, Y ), Z ) ), 
% 0.43/1.18    equivalent( equivalent( X, U ), equivalent( T, U ) ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, X ), :=( Y, Z ), :=( Z, T ), :=( T, Z ), 
% 0.43/1.18    :=( U, equivalent( equivalent( X, Y ), equivalent( X, Y ) ) )] ), 
% 0.43/1.18    substitution( 1, [ :=( X, X ), :=( Y, Z ), :=( Z, equivalent( T, Z ) ), 
% 0.43/1.18    :=( T, X ), :=( U, Y )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 36, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), equivalent( X
% 0.43/1.18    , Y ) ) ) ] )
% 0.43/1.18  , clause( 3137, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.43/1.18    equivalent( X, Y ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.43/1.18     )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3139, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.18     ), equivalent( X, Y ) ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 0.43/1.18  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.43/1.18     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.43/1.18  , 2, clause( 36, [ 'is_a_theorem'( equivalent( equivalent( X, Y ), 
% 0.43/1.18    equivalent( X, Y ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, equivalent( equivalent( X, Y ), equivalent( 
% 0.43/1.18    X, Y ) ) ), :=( Y, Z )] ), substitution( 1, [ :=( X, X ), :=( Y, Y )] )
% 0.43/1.18    ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 43, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 0.43/1.18  , clause( 3139, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 0.43/1.18    , Y ), equivalent( X, Y ) ), Z ) ) ), 'is_a_theorem'( Z ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 0.43/1.18    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3140, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, Z
% 0.43/1.18     ) ), equivalent( X, equivalent( equivalent( Y, T ), equivalent( Z, T ) )
% 0.43/1.18     ) ) ) ] )
% 0.43/1.18  , clause( 43, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 0.43/1.18  , 1, clause( 19, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U ), equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, T ) ), U ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, X ), :=( Y, equivalent( equivalent( Y, T ), 
% 0.43/1.18    equivalent( Z, T ) ) ), :=( Z, equivalent( equivalent( X, equivalent( Y, 
% 0.43/1.18    Z ) ), equivalent( X, equivalent( equivalent( Y, T ), equivalent( Z, T )
% 0.43/1.18     ) ) ) )] ), substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, T ), :=( T
% 0.43/1.18    , Z ), :=( U, equivalent( X, equivalent( equivalent( Y, T ), equivalent( 
% 0.43/1.18    Z, T ) ) ) )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 45, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y, Z )
% 0.43/1.18     ), equivalent( X, equivalent( equivalent( Y, T ), equivalent( Z, T ) ) )
% 0.43/1.18     ) ) ] )
% 0.43/1.18  , clause( 3140, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y
% 0.43/1.18    , Z ) ), equivalent( X, equivalent( equivalent( Y, T ), equivalent( Z, T
% 0.43/1.18     ) ) ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.43/1.18    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3141, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 0.43/1.18    , equivalent( Z, Y ) ), equivalent( X, Z ) ) ) ] )
% 0.43/1.18  , clause( 43, [ 'is_a_theorem'( Z ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( X, Y ), equivalent( X, Y ) ), Z ) ) ) ] )
% 0.43/1.18  , 1, clause( 9, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.18     ), Z ), equivalent( equivalent( equivalent( X, T ), equivalent( Y, T ) )
% 0.43/1.18    , Z ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, X ), :=( Y, Z ), :=( Z, equivalent( 
% 0.43/1.18    equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), equivalent( X, Z )
% 0.43/1.18     ) )] ), substitution( 1, [ :=( X, X ), :=( Y, Z ), :=( Z, equivalent( X
% 0.43/1.18    , Z ) ), :=( T, Y )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 47, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 0.43/1.18    equivalent( Z, Y ) ), equivalent( X, Z ) ) ) ] )
% 0.43/1.18  , clause( 3141, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.18     ), equivalent( Z, Y ) ), equivalent( X, Z ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 0.43/1.18    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3143, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, Y ), equivalent( Z, Y ) ), equivalent( X, Z ) ), T ) ) ), 
% 0.43/1.18    'is_a_theorem'( T ) ] )
% 0.43/1.18  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.43/1.18     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.43/1.18  , 2, clause( 47, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.18     ), equivalent( Z, Y ) ), equivalent( X, Z ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, Y ), 
% 0.43/1.18    equivalent( Z, Y ) ), equivalent( X, Z ) ) ), :=( Y, T )] ), 
% 0.43/1.18    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 51, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), 
% 0.43/1.18    equivalent( X, Z ) ), T ) ) ) ] )
% 0.43/1.18  , clause( 3143, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, Y ), equivalent( Z, Y ) ), equivalent( X, Z ) ), T ) ) ), 
% 0.43/1.18    'is_a_theorem'( T ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.43/1.18    permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3144, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y )
% 0.43/1.18    , equivalent( Z, Y ) ), equivalent( equivalent( equivalent( X, T ), U ), 
% 0.43/1.18    equivalent( equivalent( Z, T ), U ) ) ) ) ] )
% 0.43/1.18  , clause( 14, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), 
% 0.43/1.18    equivalent( equivalent( X, T ), equivalent( Z, T ) ) ), U ) ) ) ] )
% 0.43/1.18  , 1, clause( 45, [ 'is_a_theorem'( equivalent( equivalent( X, equivalent( Y
% 0.43/1.18    , Z ) ), equivalent( X, equivalent( equivalent( Y, T ), equivalent( Z, T
% 0.43/1.18     ) ) ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), 
% 0.43/1.18    :=( U, equivalent( equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), 
% 0.43/1.18    equivalent( equivalent( equivalent( X, T ), U ), equivalent( equivalent( 
% 0.43/1.18    Z, T ), U ) ) ) )] ), substitution( 1, [ :=( X, equivalent( equivalent( X
% 0.43/1.18    , Y ), equivalent( Z, Y ) ) ), :=( Y, equivalent( X, T ) ), :=( Z, 
% 0.43/1.18    equivalent( Z, T ) ), :=( T, U )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 70, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y ), 
% 0.43/1.18    equivalent( Z, Y ) ), equivalent( equivalent( equivalent( X, T ), U ), 
% 0.43/1.18    equivalent( equivalent( Z, T ), U ) ) ) ) ] )
% 0.43/1.18  , clause( 3144, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.18     ), equivalent( Z, Y ) ), equivalent( equivalent( equivalent( X, T ), U )
% 0.43/1.18    , equivalent( equivalent( Z, T ), U ) ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.18    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3145, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( T, Y ) ), equivalent( X, equivalent( T
% 0.43/1.18    , Z ) ) ) ) ] )
% 0.43/1.18  , clause( 51, [ 'is_a_theorem'( T ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( equivalent( X, Y ), equivalent( Z, Y ) ), 
% 0.43/1.18    equivalent( X, Z ) ), T ) ) ) ] )
% 0.43/1.18  , 1, clause( 19, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U ), equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, T ) ), U ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, X ), :=( Y, equivalent( Y, Z ) ), :=( Z, 
% 0.43/1.18    equivalent( T, Z ) ), :=( T, equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( T, Y ) ), equivalent( X, equivalent( T
% 0.43/1.18    , Z ) ) ) )] ), substitution( 1, [ :=( X, equivalent( X, equivalent( Y, Z
% 0.43/1.18     ) ) ), :=( Y, T ), :=( Z, Z ), :=( T, Y ), :=( U, equivalent( X, 
% 0.43/1.18    equivalent( T, Z ) ) )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 84, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( T, Y ) ), equivalent( X, equivalent( T
% 0.43/1.18    , Z ) ) ) ) ] )
% 0.43/1.18  , clause( 3145, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( T, Y ) ), equivalent( X, equivalent( T
% 0.43/1.18    , Z ) ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T )] ), 
% 0.43/1.18    permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3147, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, Z ) ), equivalent( T, Y ) ), equivalent( X
% 0.43/1.18    , equivalent( T, Z ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.43/1.18  , clause( 0, [ ~( 'is_a_theorem'( equivalent( X, Y ) ) ), 'is_a_theorem'( Y
% 0.43/1.18     ), ~( 'is_a_theorem'( X ) ) ] )
% 0.43/1.18  , 2, clause( 84, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( T, Y ) ), equivalent( X, equivalent( T
% 0.43/1.18    , Z ) ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( T, Y ) ), equivalent( X, equivalent( T
% 0.43/1.18    , Z ) ) ) ), :=( Y, U )] ), substitution( 1, [ :=( X, X ), :=( Y, Y ), 
% 0.43/1.18    :=( Z, Z ), :=( T, T )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 89, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( equivalent( X, equivalent( Y, Z ) ), equivalent( 
% 0.43/1.18    T, Y ) ), equivalent( X, equivalent( T, Z ) ) ), U ) ) ) ] )
% 0.43/1.18  , clause( 3147, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, Z ) ), equivalent( T, Y ) ), equivalent( X
% 0.43/1.18    , equivalent( T, Z ) ) ), U ) ) ), 'is_a_theorem'( U ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.18    , U )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3148, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U
% 0.43/1.18     ), W ), equivalent( equivalent( equivalent( X, equivalent( Y, T ) ), U )
% 0.43/1.18    , W ) ) ) ] )
% 0.43/1.18  , clause( 6, [ 'is_a_theorem'( V1 ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( X, equivalent( X, equivalent( equivalent( Y, Z )
% 0.43/1.18    , equivalent( equivalent( Y, T ), equivalent( Z, T ) ) ) ) ), equivalent( 
% 0.43/1.18    equivalent( U, W ), equivalent( equivalent( U, V0 ), equivalent( W, V0 )
% 0.43/1.18     ) ) ), V1 ) ) ) ] )
% 0.43/1.18  , 1, clause( 70, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, Y
% 0.43/1.18     ), equivalent( Z, Y ) ), equivalent( equivalent( equivalent( X, T ), U )
% 0.43/1.18    , equivalent( equivalent( Z, T ), U ) ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, equivalent( X, equivalent( equivalent( Y, Z
% 0.43/1.18     ), equivalent( T, Z ) ) ) ), :=( Y, Y ), :=( Z, T ), :=( T, Z ), :=( U, 
% 0.43/1.18    X ), :=( W, equivalent( Y, T ) ), :=( V0, equivalent( equivalent( Y, Z )
% 0.43/1.18    , equivalent( T, Z ) ) ), :=( V1, equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U
% 0.43/1.18     ), W ), equivalent( equivalent( equivalent( X, equivalent( Y, T ) ), U )
% 0.43/1.18    , W ) ) )] ), substitution( 1, [ :=( X, equivalent( X, equivalent( 
% 0.43/1.18    equivalent( Y, Z ), equivalent( T, Z ) ) ) ), :=( Y, equivalent( 
% 0.43/1.18    equivalent( X, equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), 
% 0.43/1.18    equivalent( equivalent( Y, T ), equivalent( equivalent( Y, Z ), 
% 0.43/1.18    equivalent( T, Z ) ) ) ) ), :=( Z, equivalent( X, equivalent( Y, T ) ) )
% 0.43/1.18    , :=( T, U ), :=( U, W )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 101, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U
% 0.43/1.18     ), W ), equivalent( equivalent( equivalent( X, equivalent( Y, T ) ), U )
% 0.43/1.18    , W ) ) ) ] )
% 0.43/1.18  , clause( 3148, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U
% 0.43/1.18     ), W ), equivalent( equivalent( equivalent( X, equivalent( Y, T ) ), U )
% 0.43/1.18    , W ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.18    , U ), :=( W, W )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3149, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( T, equivalent( Y, U ) ) ), equivalent( 
% 0.43/1.18    X, equivalent( T, equivalent( Z, U ) ) ) ) ) ] )
% 0.43/1.18  , clause( 89, [ 'is_a_theorem'( U ), ~( 'is_a_theorem'( equivalent( 
% 0.43/1.18    equivalent( equivalent( equivalent( X, equivalent( Y, Z ) ), equivalent( 
% 0.43/1.18    T, Y ) ), equivalent( X, equivalent( T, Z ) ) ), U ) ) ) ] )
% 0.43/1.18  , 1, clause( 101, [ 'is_a_theorem'( equivalent( equivalent( equivalent( 
% 0.43/1.18    equivalent( X, equivalent( equivalent( Y, Z ), equivalent( T, Z ) ) ), U
% 0.43/1.18     ), W ), equivalent( equivalent( equivalent( X, equivalent( Y, T ) ), U )
% 0.43/1.18    , W ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [ :=( X, X ), :=( Y, equivalent( Y, U ) ), :=( Z, 
% 0.43/1.18    equivalent( Z, U ) ), :=( T, T ), :=( U, equivalent( equivalent( 
% 0.43/1.18    equivalent( X, equivalent( Y, Z ) ), equivalent( T, equivalent( Y, U ) )
% 0.43/1.18     ), equivalent( X, equivalent( T, equivalent( Z, U ) ) ) ) )] ), 
% 0.43/1.18    substitution( 1, [ :=( X, X ), :=( Y, Y ), :=( Z, U ), :=( T, Z ), :=( U
% 0.43/1.18    , equivalent( T, equivalent( Y, U ) ) ), :=( W, equivalent( X, equivalent( 
% 0.43/1.18    T, equivalent( Z, U ) ) ) )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 2876, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( T, equivalent( Y, U ) ) ), equivalent( 
% 0.43/1.18    X, equivalent( T, equivalent( Z, U ) ) ) ) ) ] )
% 0.43/1.18  , clause( 3149, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X, 
% 0.43/1.18    equivalent( Y, Z ) ), equivalent( T, equivalent( Y, U ) ) ), equivalent( 
% 0.43/1.18    X, equivalent( T, equivalent( Z, U ) ) ) ) ) ] )
% 0.43/1.18  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z ), :=( T, T ), :=( U
% 0.43/1.18    , U )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  resolution(
% 0.43/1.18  clause( 3150, [] )
% 0.43/1.18  , clause( 2, [ ~( 'is_a_theorem'( equivalent( equivalent( equivalent( a, 
% 0.43/1.18    equivalent( b, c ) ), equivalent( e, equivalent( b, f ) ) ), equivalent( 
% 0.43/1.18    a, equivalent( e, equivalent( c, f ) ) ) ) ) ) ] )
% 0.43/1.18  , 0, clause( 2876, [ 'is_a_theorem'( equivalent( equivalent( equivalent( X
% 0.43/1.18    , equivalent( Y, Z ) ), equivalent( T, equivalent( Y, U ) ) ), equivalent( 
% 0.43/1.18    X, equivalent( T, equivalent( Z, U ) ) ) ) ) ] )
% 0.43/1.18  , 0, substitution( 0, [] ), substitution( 1, [ :=( X, a ), :=( Y, b ), :=( 
% 0.43/1.18    Z, c ), :=( T, e ), :=( U, f )] )).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  subsumption(
% 0.43/1.18  clause( 3116, [] )
% 0.43/1.18  , clause( 3150, [] )
% 0.43/1.18  , substitution( 0, [] ), permutation( 0, [] ) ).
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  end.
% 0.43/1.18  
% 0.43/1.18  % ABCDEFGHIJKLMNOPQRSTUVWXYZ
% 0.43/1.18  
% 0.43/1.18  Memory use:
% 0.43/1.18  
% 0.43/1.18  space for terms:        80582
% 0.43/1.18  space for clauses:      374141
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  clauses generated:      7238
% 0.43/1.18  clauses kept:           3117
% 0.43/1.18  clauses selected:       335
% 0.43/1.18  clauses deleted:        6
% 0.43/1.18  clauses inuse deleted:  3
% 0.43/1.18  
% 0.43/1.18  subsentry:          4548
% 0.43/1.18  literals s-matched: 4126
% 0.43/1.18  literals matched:   4126
% 0.43/1.18  full subsumption:   0
% 0.43/1.18  
% 0.43/1.18  checksum:           -1526083144
% 0.43/1.18  
% 0.43/1.18  
% 0.43/1.18  Bliksem ended
%------------------------------------------------------------------------------