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CSE_E---1.7.THM-CRf.s

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%------------------------------------------------------------------------------
% File     : CSE_E---1.7
% Problem  : SWC015+1 : TPTP v9.2.1. Released v2.4.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : /export/starexec/sandbox/solver/bin/lemma_parallel_prover %s --lemma-prover /export/starexec/sandbox/solver/bin/cse --final-prover /export/starexec/sandbox/solver/bin/eprover --proof-time %d --global-time-limit %d

% Computer : n023.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  : 300s
% DateTime : Tue May  5 05:17:54 PM UTC 2026

% Result   : Theorem 1.44s 1.76s
% Output   : CNFRefutation 1.44s
% Verified : 
% SZS Type : Refutation
%            Derivation depth      :   24
%            Number of leaves      :   13
% Syntax   : Number of formulae    :   80 (  12 unt;   0 def)
%            Number of atoms       :  310 ( 121 equ)
%            Maximal formula atoms :   34 (   3 avg)
%            Number of connectives :  377 ( 147   ~; 164   |;  33   &)
%                                         (   2 <=>;  31  =>;   0  <=;   0 <~>)
%            Maximal formula depth :   22 (   5 avg)
%            Maximal term depth    :    3 (   1 avg)
%            Number of predicates  :    6 (   4 usr;   1 prp; 0-2 aty)
%            Number of functors    :   10 (  10 usr;   5 con; 0-2 aty)
%            Number of variables   :   95 (   0 sgn  49   !;   9   ?)

% Comments : 
%------------------------------------------------------------------------------
fof(co1,conjecture,
    ! [X1] :
      ( ssList(X1)
     => ! [X2] :
          ( ssList(X2)
         => ! [X3] :
              ( ssList(X3)
             => ! [X4] :
                  ( ssList(X4)
                 => ( X2 != X4
                    | X1 != X3
                    | ( ( ~ neq(X2,nil)
                        | ? [X5] :
                            ( ssList(X5)
                            & X4 != X5
                            & ? [X6] :
                                ( ssList(X6)
                                & tl(X4) = X6
                                & app(X3,X6) = X5
                                & neq(nil,X4) ) )
                        | ? [X7] :
                            ( ssItem(X7)
                            & ? [X8] :
                                ( ssList(X8)
                                & cons(X7,nil) = X1
                                & app(cons(X7,nil),X8) = X2 ) ) )
                      & ( ~ neq(X2,nil)
                        | neq(X4,nil) ) ) ) ) ) ) ),
    file('/export/starexec/sandbox/benchmark/theBenchmark.p',co1) ).

fof(ax24,axiom,
    ! [X1] :
      ( ssList(X1)
     => ( nil != X1
       => ssList(tl(X1)) ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax24) ).

fof(ax26,axiom,
    ! [X1] :
      ( ssList(X1)
     => ! [X2] :
          ( ssList(X2)
         => ssList(app(X1,X2)) ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax26) ).

fof(ax15,axiom,
    ! [X1] :
      ( ssList(X1)
     => ! [X2] :
          ( ssList(X2)
         => ( neq(X1,X2)
          <=> X1 != X2 ) ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax15) ).

fof(ax86,axiom,
    ! [X1] :
      ( ssList(X1)
     => ! [X2] :
          ( ssList(X2)
         => ( nil != X1
           => tl(app(X1,X2)) = app(tl(X1),X2) ) ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax86) ).

fof(ax17,axiom,
    ssList(nil),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax17) ).

fof(ax79,axiom,
    ! [X1] :
      ( ssList(X1)
     => ! [X2] :
          ( ssList(X2)
         => ! [X3] :
              ( ssList(X3)
             => ( app(X3,X2) = app(X1,X2)
               => X3 = X1 ) ) ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax79) ).

fof(ax28,axiom,
    ! [X1] :
      ( ssList(X1)
     => app(nil,X1) = X1 ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax28) ).

fof(ax4,axiom,
    ! [X1] :
      ( ssList(X1)
     => ( singletonP(X1)
      <=> ? [X2] :
            ( ssItem(X2)
            & cons(X2,nil) = X1 ) ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax4) ).

fof(ax16,axiom,
    ! [X1] :
      ( ssList(X1)
     => ! [X2] :
          ( ssItem(X2)
         => ssList(cons(X2,X1)) ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax16) ).

fof(ax78,axiom,
    ! [X1] :
      ( ssList(X1)
     => ( nil != X1
       => cons(hd(X1),tl(X1)) = X1 ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax78) ).

fof(ax22,axiom,
    ! [X1] :
      ( ssList(X1)
     => ( nil != X1
       => ssItem(hd(X1)) ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax22) ).

fof(ax18,axiom,
    ! [X1] :
      ( ssList(X1)
     => ! [X2] :
          ( ssItem(X2)
         => cons(X2,X1) != X1 ) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SWC001+0.ax',ax18) ).

fof(c_0_13,negated_conjecture,
    ~ ! [X1] :
        ( ssList(X1)
       => ! [X2] :
            ( ssList(X2)
           => ! [X3] :
                ( ssList(X3)
               => ! [X4] :
                    ( ssList(X4)
                   => ( X2 != X4
                      | X1 != X3
                      | ( ( ~ neq(X2,nil)
                          | ? [X5] :
                              ( ssList(X5)
                              & X4 != X5
                              & ? [X6] :
                                  ( ssList(X6)
                                  & tl(X4) = X6
                                  & app(X3,X6) = X5
                                  & neq(nil,X4) ) )
                          | ? [X7] :
                              ( ssItem(X7)
                              & ? [X8] :
                                  ( ssList(X8)
                                  & cons(X7,nil) = X1
                                  & app(cons(X7,nil),X8) = X2 ) ) )
                        & ( ~ neq(X2,nil)
                          | neq(X4,nil) ) ) ) ) ) ) ),
    inference(fof_simplification,[status(thm)],[inference(assume_negation,[status(cth)],[co1])]) ).

fof(c_0_14,negated_conjecture,
    ! [X468,X469,X470,X471] :
      ( ssList(esk48_0)
      & ssList(esk49_0)
      & ssList(esk50_0)
      & ssList(esk51_0)
      & esk49_0 = esk51_0
      & esk48_0 = esk50_0
      & ( neq(esk49_0,nil)
        | neq(esk49_0,nil) )
      & ( ~ neq(esk51_0,nil)
        | neq(esk49_0,nil) )
      & ( neq(esk49_0,nil)
        | ~ ssList(X468)
        | esk51_0 = X468
        | ~ ssList(X469)
        | tl(esk51_0) != X469
        | app(esk50_0,X469) != X468
        | ~ neq(nil,esk51_0) )
      & ( ~ neq(esk51_0,nil)
        | ~ ssList(X468)
        | esk51_0 = X468
        | ~ ssList(X469)
        | tl(esk51_0) != X469
        | app(esk50_0,X469) != X468
        | ~ neq(nil,esk51_0) )
      & ( neq(esk49_0,nil)
        | ~ ssItem(X470)
        | ~ ssList(X471)
        | cons(X470,nil) != esk48_0
        | app(cons(X470,nil),X471) != esk49_0 )
      & ( ~ neq(esk51_0,nil)
        | ~ ssItem(X470)
        | ~ ssList(X471)
        | cons(X470,nil) != esk48_0
        | app(cons(X470,nil),X471) != esk49_0 ) ),
    inference(distribute,[status(thm)],[inference(shift_quantors,[status(thm)],[inference(skolemize,[status(esa)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[c_0_13])])])])]) ).

cnf(c_0_15,negated_conjecture,
    ( neq(esk49_0,nil)
    | neq(esk49_0,nil) ),
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

cnf(c_0_16,negated_conjecture,
    neq(esk49_0,nil),
    inference(cn,[status(thm)],[c_0_15]) ).

cnf(c_0_17,negated_conjecture,
    esk49_0 = esk51_0,
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

cnf(c_0_18,negated_conjecture,
    ( esk51_0 = X1
    | ~ neq(esk51_0,nil)
    | ~ ssList(X1)
    | ~ ssList(X2)
    | tl(esk51_0) != X2
    | app(esk50_0,X2) != X1
    | ~ neq(nil,esk51_0) ),
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

cnf(c_0_19,negated_conjecture,
    esk48_0 = esk50_0,
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

cnf(c_0_20,negated_conjecture,
    neq(esk51_0,nil),
    inference(rw,[status(thm)],[c_0_16,c_0_17]) ).

fof(c_0_21,plain,
    ! [X340] :
      ( ~ ssList(X340)
      | nil = X340
      | ssList(tl(X340)) ),
    inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax24])]) ).

cnf(c_0_22,negated_conjecture,
    ssList(esk49_0),
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

cnf(c_0_23,negated_conjecture,
    ( app(esk48_0,tl(esk51_0)) = esk51_0
    | ~ ssList(app(esk48_0,tl(esk51_0)))
    | ~ ssList(tl(esk51_0))
    | ~ neq(nil,esk51_0) ),
    inference(er,[status(thm)],[inference(er,[status(thm)],[inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(rw,[status(thm)],[c_0_18,c_0_19]),c_0_20])])])]) ).

cnf(c_0_24,plain,
    ( nil = X1
    | ssList(tl(X1))
    | ~ ssList(X1) ),
    inference(split_conjunct,[status(thm)],[c_0_21]) ).

cnf(c_0_25,negated_conjecture,
    ssList(esk51_0),
    inference(rw,[status(thm)],[c_0_22,c_0_17]) ).

fof(c_0_26,plain,
    ! [X343,X344] :
      ( ~ ssList(X343)
      | ~ ssList(X344)
      | ssList(app(X343,X344)) ),
    inference(shift_quantors,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax26])])]) ).

cnf(c_0_27,negated_conjecture,
    ( app(esk48_0,tl(esk51_0)) = esk51_0
    | esk51_0 = nil
    | ~ ssList(app(esk48_0,tl(esk51_0)))
    | ~ neq(nil,esk51_0) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_23,c_0_24]),c_0_25])]) ).

cnf(c_0_28,plain,
    ( ssList(app(X1,X2))
    | ~ ssList(X1)
    | ~ ssList(X2) ),
    inference(split_conjunct,[status(thm)],[c_0_26]) ).

cnf(c_0_29,negated_conjecture,
    ssList(esk48_0),
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

cnf(c_0_30,negated_conjecture,
    ( app(esk48_0,tl(esk51_0)) = esk51_0
    | esk51_0 = nil
    | ~ ssList(tl(esk51_0))
    | ~ neq(nil,esk51_0) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_27,c_0_28]),c_0_29])]) ).

fof(c_0_31,plain,
    ! [X322,X323] :
      ( ( ~ neq(X322,X323)
        | X322 != X323
        | ~ ssList(X323)
        | ~ ssList(X322) )
      & ( X322 = X323
        | neq(X322,X323)
        | ~ ssList(X323)
        | ~ ssList(X322) ) ),
    inference(distribute,[status(thm)],[inference(shift_quantors,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax15])])])]) ).

fof(c_0_32,plain,
    ! [X443,X444] :
      ( ~ ssList(X443)
      | ~ ssList(X444)
      | nil = X443
      | tl(app(X443,X444)) = app(tl(X443),X444) ),
    inference(shift_quantors,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax86])])]) ).

cnf(c_0_33,negated_conjecture,
    ( app(esk48_0,tl(esk51_0)) = esk51_0
    | esk51_0 = nil
    | ~ neq(nil,esk51_0) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_30,c_0_24]),c_0_25])]) ).

cnf(c_0_34,plain,
    ( X1 = X2
    | neq(X1,X2)
    | ~ ssList(X2)
    | ~ ssList(X1) ),
    inference(split_conjunct,[status(thm)],[c_0_31]) ).

cnf(c_0_35,plain,
    ssList(nil),
    inference(split_conjunct,[status(thm)],[ax17]) ).

fof(c_0_36,plain,
    ! [X427,X428,X429] :
      ( ~ ssList(X427)
      | ~ ssList(X428)
      | ~ ssList(X429)
      | app(X429,X428) != app(X427,X428)
      | X429 = X427 ),
    inference(shift_quantors,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax79])])]) ).

fof(c_0_37,plain,
    ! [X348] :
      ( ~ ssList(X348)
      | app(nil,X348) = X348 ),
    inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax28])]) ).

cnf(c_0_38,plain,
    ( nil = X1
    | tl(app(X1,X2)) = app(tl(X1),X2)
    | ~ ssList(X1)
    | ~ ssList(X2) ),
    inference(split_conjunct,[status(thm)],[c_0_32]) ).

cnf(c_0_39,negated_conjecture,
    ( app(esk48_0,tl(esk51_0)) = esk51_0
    | esk51_0 = nil ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_33,c_0_34]),c_0_25]),c_0_35])]) ).

cnf(c_0_40,plain,
    ( X3 = X1
    | ~ ssList(X1)
    | ~ ssList(X2)
    | ~ ssList(X3)
    | app(X3,X2) != app(X1,X2) ),
    inference(split_conjunct,[status(thm)],[c_0_36]) ).

cnf(c_0_41,plain,
    ( app(nil,X1) = X1
    | ~ ssList(X1) ),
    inference(split_conjunct,[status(thm)],[c_0_37]) ).

cnf(c_0_42,negated_conjecture,
    ( app(tl(esk48_0),tl(esk51_0)) = tl(esk51_0)
    | esk51_0 = nil
    | esk48_0 = nil
    | ~ ssList(tl(esk51_0)) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_38,c_0_39]),c_0_29])]) ).

cnf(c_0_43,negated_conjecture,
    ( ~ neq(esk51_0,nil)
    | ~ ssItem(X1)
    | ~ ssList(X2)
    | cons(X1,nil) != esk48_0
    | app(cons(X1,nil),X2) != esk49_0 ),
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

fof(c_0_44,plain,
    ! [X230,X232] :
      ( ( ssItem(esk5_1(X230))
        | ~ singletonP(X230)
        | ~ ssList(X230) )
      & ( cons(esk5_1(X230),nil) = X230
        | ~ singletonP(X230)
        | ~ ssList(X230) )
      & ( ~ ssItem(X232)
        | cons(X232,nil) != X230
        | singletonP(X230)
        | ~ ssList(X230) ) ),
    inference(distribute,[status(thm)],[inference(shift_quantors,[status(thm)],[inference(skolemize,[status(esa)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax4])])])])]) ).

cnf(c_0_45,plain,
    ( X1 = nil
    | app(X1,X2) != X2
    | ~ ssList(X2)
    | ~ ssList(X1) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_40,c_0_41]),c_0_35])]) ).

cnf(c_0_46,negated_conjecture,
    ( app(tl(esk48_0),tl(esk51_0)) = tl(esk51_0)
    | esk48_0 = nil
    | esk51_0 = nil ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_42,c_0_24]),c_0_25])]) ).

cnf(c_0_47,negated_conjecture,
    ( app(cons(X1,nil),X2) != esk51_0
    | cons(X1,nil) != esk48_0
    | ~ ssList(X2)
    | ~ ssItem(X1) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(rw,[status(thm)],[c_0_43,c_0_17]),c_0_20])]) ).

cnf(c_0_48,plain,
    ( cons(esk5_1(X1),nil) = X1
    | ~ singletonP(X1)
    | ~ ssList(X1) ),
    inference(split_conjunct,[status(thm)],[c_0_44]) ).

cnf(c_0_49,negated_conjecture,
    ( tl(esk48_0) = nil
    | esk51_0 = nil
    | esk48_0 = nil
    | ~ ssList(tl(esk51_0))
    | ~ ssList(tl(esk48_0)) ),
    inference(spm,[status(thm)],[c_0_45,c_0_46]) ).

cnf(c_0_50,negated_conjecture,
    ( app(esk48_0,X1) != esk51_0
    | ~ singletonP(esk48_0)
    | ~ ssList(X1)
    | ~ ssItem(esk5_1(esk48_0)) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(er,[status(thm)],[inference(spm,[status(thm)],[c_0_47,c_0_48])]),c_0_29])]) ).

cnf(c_0_51,plain,
    ( ssItem(esk5_1(X1))
    | ~ singletonP(X1)
    | ~ ssList(X1) ),
    inference(split_conjunct,[status(thm)],[c_0_44]) ).

cnf(c_0_52,plain,
    ( singletonP(X2)
    | ~ ssItem(X1)
    | cons(X1,nil) != X2
    | ~ ssList(X2) ),
    inference(split_conjunct,[status(thm)],[c_0_44]) ).

fof(c_0_53,plain,
    ! [X324,X325] :
      ( ~ ssList(X324)
      | ~ ssItem(X325)
      | ssList(cons(X325,X324)) ),
    inference(shift_quantors,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax16])])]) ).

fof(c_0_54,plain,
    ! [X426] :
      ( ~ ssList(X426)
      | nil = X426
      | cons(hd(X426),tl(X426)) = X426 ),
    inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax78])]) ).

cnf(c_0_55,negated_conjecture,
    ( tl(esk48_0) = nil
    | esk48_0 = nil
    | esk51_0 = nil
    | ~ ssList(tl(esk48_0)) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_49,c_0_24]),c_0_25])]) ).

cnf(c_0_56,negated_conjecture,
    ( app(esk48_0,X1) != esk51_0
    | ~ singletonP(esk48_0)
    | ~ ssList(X1) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_50,c_0_51]),c_0_29])]) ).

cnf(c_0_57,plain,
    ( singletonP(cons(X1,nil))
    | ~ ssList(cons(X1,nil))
    | ~ ssItem(X1) ),
    inference(er,[status(thm)],[c_0_52]) ).

cnf(c_0_58,plain,
    ( ssList(cons(X2,X1))
    | ~ ssList(X1)
    | ~ ssItem(X2) ),
    inference(split_conjunct,[status(thm)],[c_0_53]) ).

cnf(c_0_59,plain,
    ( nil = X1
    | cons(hd(X1),tl(X1)) = X1
    | ~ ssList(X1) ),
    inference(split_conjunct,[status(thm)],[c_0_54]) ).

cnf(c_0_60,negated_conjecture,
    ( tl(esk48_0) = nil
    | esk51_0 = nil
    | esk48_0 = nil ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_55,c_0_24]),c_0_29])]) ).

cnf(c_0_61,negated_conjecture,
    ( esk51_0 = nil
    | ~ singletonP(esk48_0)
    | ~ ssList(tl(esk51_0)) ),
    inference(spm,[status(thm)],[c_0_56,c_0_39]) ).

cnf(c_0_62,plain,
    ( singletonP(cons(X1,nil))
    | ~ ssItem(X1) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_57,c_0_58]),c_0_35])]) ).

cnf(c_0_63,negated_conjecture,
    ( cons(hd(esk48_0),nil) = esk48_0
    | esk51_0 = nil
    | esk48_0 = nil ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_59,c_0_60]),c_0_29])]) ).

cnf(c_0_64,negated_conjecture,
    ( esk51_0 = nil
    | ~ singletonP(esk48_0) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_61,c_0_24]),c_0_25])]) ).

fof(c_0_65,plain,
    ! [X337] :
      ( ~ ssList(X337)
      | nil = X337
      | ssItem(hd(X337)) ),
    inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax22])]) ).

cnf(c_0_66,negated_conjecture,
    ( esk48_0 = nil
    | esk51_0 = nil
    | ~ ssItem(hd(esk48_0)) ),
    inference(csr,[status(thm)],[inference(spm,[status(thm)],[c_0_62,c_0_63]),c_0_64]) ).

cnf(c_0_67,plain,
    ( nil = X1
    | ssItem(hd(X1))
    | ~ ssList(X1) ),
    inference(split_conjunct,[status(thm)],[c_0_65]) ).

cnf(c_0_68,negated_conjecture,
    ( esk51_0 = nil
    | esk48_0 = nil ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_66,c_0_67]),c_0_29])]) ).

fof(c_0_69,plain,
    ! [X326,X327] :
      ( ~ ssList(X326)
      | ~ ssItem(X327)
      | cons(X327,X326) != X326 ),
    inference(shift_quantors,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[ax18])])]) ).

cnf(c_0_70,negated_conjecture,
    ( app(nil,tl(esk51_0)) = esk51_0
    | esk51_0 = nil ),
    inference(spm,[status(thm)],[c_0_39,c_0_68]) ).

cnf(c_0_71,plain,
    ( ~ ssList(X1)
    | ~ ssItem(X2)
    | cons(X2,X1) != X1 ),
    inference(split_conjunct,[status(thm)],[c_0_69]) ).

cnf(c_0_72,negated_conjecture,
    ( tl(esk51_0) = esk51_0
    | esk51_0 = nil
    | ~ ssList(tl(esk51_0)) ),
    inference(spm,[status(thm)],[c_0_41,c_0_70]) ).

cnf(c_0_73,plain,
    ( nil = X1
    | tl(X1) != X1
    | ~ ssList(X1) ),
    inference(csr,[status(thm)],[inference(csr,[status(thm)],[inference(spm,[status(thm)],[c_0_71,c_0_59]),c_0_67]),c_0_24]) ).

cnf(c_0_74,negated_conjecture,
    ( tl(esk51_0) = esk51_0
    | esk51_0 = nil ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_72,c_0_24]),c_0_25])]) ).

cnf(c_0_75,plain,
    ( ~ neq(X1,X2)
    | X1 != X2
    | ~ ssList(X2)
    | ~ ssList(X1) ),
    inference(split_conjunct,[status(thm)],[c_0_31]) ).

cnf(c_0_76,negated_conjecture,
    esk51_0 = nil,
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_73,c_0_74]),c_0_25])]) ).

cnf(c_0_77,plain,
    ( ~ ssList(X1)
    | ~ neq(X1,X1) ),
    inference(er,[status(thm)],[c_0_75]) ).

cnf(c_0_78,negated_conjecture,
    neq(nil,nil),
    inference(rw,[status(thm)],[c_0_20,c_0_76]) ).

cnf(c_0_79,negated_conjecture,
    $false,
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_77,c_0_78]),c_0_35])]),
    [proof] ).

%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.12  % Problem    : SWC015+1 : TPTP v9.2.1. Released v2.4.0.
% 0.00/0.12  % Command    : /export/starexec/sandbox/solver/bin/lemma_parallel_prover %s --lemma-prover /export/starexec/sandbox/solver/bin/cse --final-prover /export/starexec/sandbox/solver/bin/eprover --proof-time %d --global-time-limit %d
% 0.15/0.33  % Computer : n023.cluster.edu
% 0.15/0.33  % Model    : x86_64 x86_64
% 0.15/0.33  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.15/0.33  % Memory   : 8042.1875MB
% 0.15/0.33  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.15/0.33  % CPULimit   : 300
% 0.15/0.33  % WCLimit    : 300
% 0.15/0.33  % DateTime   : Tue May  5 04:16:08 EDT 2026
% 0.15/0.33  % CPUTime    : 
% 0.15/0.34  % start to proof: theBenchmark
% 1.44/1.76  % Version  : CSE_E---1.7
% 1.44/1.76  % Problem  : theBenchmark.p
% 1.44/1.76  % SZS status Theorem for theBenchmark.p
% 1.44/1.76  % SZS output start CNFRefutation
% See solution above
% 1.44/1.77  % Total time : 1.373s
%------------------------------------------------------------------------------