TSTP Solution File: SEU157+1 by Zipperpin---2.1.9999

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Zipperpin---2.1.9999
% Problem  : SEU157+1 : TPTP v8.1.2. Released v3.3.0.
% Transfm  : NO INFORMATION
% Format   : NO INFORMATION
% Command  : python3 /export/starexec/sandbox2/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox2/tmp/tmp.h9iaLV7IdC true

% Computer : n026.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 : Thu Aug 31 19:10:50 EDT 2023

% Result   : Theorem 1.20s 0.90s
% Output   : Refutation 1.20s
% Verified : 
% SZS Type : Refutation
%            Derivation depth      :   13
%            Number of leaves      :   18
% Syntax   : Number of formulae    :   63 (  10 unt;  13 typ;   0 def)
%            Number of atoms       :  115 (  32 equ;   0 cnn)
%            Maximal formula atoms :    5 (   2 avg)
%            Number of connectives :  552 (  35   ~;  50   |;   7   &; 452   @)
%                                         (   7 <=>;   1  =>;   0  <=;   0 <~>)
%            Maximal formula depth :   15 (   8 avg)
%            Number of types       :    2 (   0 usr)
%            Number of type conns  :   24 (  24   >;   0   *;   0   +;   0  <<)
%            Number of symbols     :   14 (  12 usr;   5 con; 0-5 aty)
%            Number of variables   :  103 (   0   ^;  99   !;   4   ?; 103   :)

% Comments : 
%------------------------------------------------------------------------------
thf(sk__7_type,type,
    sk__7: $i ).

thf(sk__5_type,type,
    sk__5: $i ).

thf(zip_tseitin_0_type,type,
    zip_tseitin_0: $i > $i > $i > $i > $i > $o ).

thf('#_fresh_sk2_type',type,
    '#_fresh_sk2': $i > $i ).

thf(sk__8_type,type,
    sk__8: $i ).

thf(in_type,type,
    in: $i > $i > $o ).

thf('#_fresh_sk1_type',type,
    '#_fresh_sk1': $i > $i ).

thf(sk__3_type,type,
    sk__3: $i > $i > $i > $i ).

thf(sk__6_type,type,
    sk__6: $i ).

thf(sk__4_type,type,
    sk__4: $i > $i > $i > $i ).

thf(cartesian_product2_type,type,
    cartesian_product2: $i > $i > $i ).

thf(ordered_pair_type,type,
    ordered_pair: $i > $i > $i ).

thf(d2_zfmisc_1,axiom,
    ! [A: $i,B: $i,C: $i] :
      ( ( C
        = ( cartesian_product2 @ A @ B ) )
    <=> ! [D: $i] :
          ( ( in @ D @ C )
        <=> ? [E: $i,F: $i] :
              ( ( in @ E @ A )
              & ( in @ F @ B )
              & ( D
                = ( ordered_pair @ E @ F ) ) ) ) ) ).

thf(zf_stmt_0,axiom,
    ! [F: $i,E: $i,D: $i,B: $i,A: $i] :
      ( ( zip_tseitin_0 @ F @ E @ D @ B @ A )
    <=> ( ( D
          = ( ordered_pair @ E @ F ) )
        & ( in @ F @ B )
        & ( in @ E @ A ) ) ) ).

thf(zip_derived_cl5,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i,X4: $i] :
      ( ( zip_tseitin_0 @ X0 @ X1 @ X2 @ X3 @ X4 )
      | ~ ( in @ X1 @ X4 )
      | ~ ( in @ X0 @ X3 )
      | ( X2
       != ( ordered_pair @ X1 @ X0 ) ) ),
    inference(cnf,[status(esa)],[zf_stmt_0]) ).

thf(zf_stmt_1,type,
    zip_tseitin_0: $i > $i > $i > $i > $i > $o ).

thf(zf_stmt_2,axiom,
    ! [A: $i,B: $i,C: $i] :
      ( ( C
        = ( cartesian_product2 @ A @ B ) )
    <=> ! [D: $i] :
          ( ( in @ D @ C )
        <=> ? [E: $i,F: $i] : ( zip_tseitin_0 @ F @ E @ D @ B @ A ) ) ) ).

thf(zip_derived_cl6,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i,X4: $i,X5: $i] :
      ( ~ ( zip_tseitin_0 @ X0 @ X1 @ X2 @ X3 @ X4 )
      | ( in @ X2 @ X5 )
      | ( X5
       != ( cartesian_product2 @ X4 @ X3 ) ) ),
    inference(cnf,[status(esa)],[zf_stmt_2]) ).

thf(zip_derived_cl45,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i,X4: $i,X5: $i] :
      ( ( X2
       != ( ordered_pair @ X3 @ X4 ) )
      | ~ ( in @ X4 @ X1 )
      | ~ ( in @ X3 @ X0 )
      | ( X5
       != ( cartesian_product2 @ X0 @ X1 ) )
      | ( in @ X2 @ X5 ) ),
    inference('sup-',[status(thm)],[zip_derived_cl5,zip_derived_cl6]) ).

thf(zip_derived_cl124,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i,X4: $i] :
      ( ( in @ ( ordered_pair @ X2 @ X1 ) @ X0 )
      | ( X0
       != ( cartesian_product2 @ X4 @ X3 ) )
      | ~ ( in @ X2 @ X4 )
      | ~ ( in @ X1 @ X3 ) ),
    inference(eq_res,[status(thm)],[zip_derived_cl45]) ).

thf(zip_derived_cl125,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i] :
      ( ~ ( in @ X1 @ X0 )
      | ~ ( in @ X3 @ X2 )
      | ( in @ ( ordered_pair @ X3 @ X1 ) @ ( cartesian_product2 @ X2 @ X0 ) ) ),
    inference(eq_res,[status(thm)],[zip_derived_cl124]) ).

thf(l55_zfmisc_1,conjecture,
    ! [A: $i,B: $i,C: $i,D: $i] :
      ( ( in @ ( ordered_pair @ A @ B ) @ ( cartesian_product2 @ C @ D ) )
    <=> ( ( in @ A @ C )
        & ( in @ B @ D ) ) ) ).

thf(zf_stmt_3,negated_conjecture,
    ~ ! [A: $i,B: $i,C: $i,D: $i] :
        ( ( in @ ( ordered_pair @ A @ B ) @ ( cartesian_product2 @ C @ D ) )
      <=> ( ( in @ A @ C )
          & ( in @ B @ D ) ) ),
    inference('cnf.neg',[status(esa)],[l55_zfmisc_1]) ).

thf(zip_derived_cl18,plain,
    ( ~ ( in @ sk__6 @ sk__8 )
    | ~ ( in @ sk__5 @ sk__7 )
    | ~ ( in @ ( ordered_pair @ sk__5 @ sk__6 ) @ ( cartesian_product2 @ sk__7 @ sk__8 ) ) ),
    inference(cnf,[status(esa)],[zf_stmt_3]) ).

thf(zip_derived_cl16,plain,
    ( ( in @ sk__5 @ sk__7 )
    | ( in @ ( ordered_pair @ sk__5 @ sk__6 ) @ ( cartesian_product2 @ sk__7 @ sk__8 ) ) ),
    inference(cnf,[status(esa)],[zf_stmt_3]) ).

thf(zip_derived_cl7,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i] :
      ( ~ ( in @ X0 @ X1 )
      | ( zip_tseitin_0 @ ( sk__4 @ X0 @ X2 @ X3 ) @ ( sk__3 @ X0 @ X2 @ X3 ) @ X0 @ X2 @ X3 )
      | ( X1
       != ( cartesian_product2 @ X3 @ X2 ) ) ),
    inference(cnf,[status(esa)],[zf_stmt_2]) ).

thf(zip_derived_cl47,plain,
    ! [X0: $i,X1: $i] :
      ( ( in @ sk__5 @ sk__7 )
      | ( ( cartesian_product2 @ sk__7 @ sk__8 )
       != ( cartesian_product2 @ X1 @ X0 ) )
      | ( zip_tseitin_0 @ ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ X0 @ X1 ) @ ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ X0 @ X1 ) @ ( ordered_pair @ sk__5 @ sk__6 ) @ X0 @ X1 ) ),
    inference('sup-',[status(thm)],[zip_derived_cl16,zip_derived_cl7]) ).

thf(zip_derived_cl49,plain,
    ( ( zip_tseitin_0 @ ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 )
    | ( in @ sk__5 @ sk__7 ) ),
    inference(eq_res,[status(thm)],[zip_derived_cl47]) ).

thf(zip_derived_cl2,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i,X4: $i] :
      ( ( X2
        = ( ordered_pair @ X0 @ X1 ) )
      | ~ ( zip_tseitin_0 @ X1 @ X0 @ X2 @ X3 @ X4 ) ),
    inference(cnf,[status(esa)],[zf_stmt_0]) ).

thf(zip_derived_cl57,plain,
    ( ( in @ sk__5 @ sk__7 )
    | ( ( ordered_pair @ sk__5 @ sk__6 )
      = ( ordered_pair @ ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) ) ) ),
    inference('sup-',[status(thm)],[zip_derived_cl49,zip_derived_cl2]) ).

thf(t33_zfmisc_1,axiom,
    ! [A: $i,B: $i,C: $i,D: $i] :
      ( ( ( ordered_pair @ A @ B )
        = ( ordered_pair @ C @ D ) )
     => ( ( A = C )
        & ( B = D ) ) ) ).

thf(zip_derived_cl21,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i] :
      ( ( X1 = X0 )
      | ( ( ordered_pair @ X1 @ X3 )
       != ( ordered_pair @ X0 @ X2 ) ) ),
    inference(cnf,[status(esa)],[t33_zfmisc_1]) ).

thf(zip_derived_cl25,plain,
    ! [X1: $i,X3: $i] :
      ( ( '#_fresh_sk1' @ ( ordered_pair @ X1 @ X3 ) )
      = X1 ),
    inference(inj_rec,[status(thm)],[zip_derived_cl21]) ).

thf(zip_derived_cl107,plain,
    ( ( ( '#_fresh_sk1' @ ( ordered_pair @ sk__5 @ sk__6 ) )
      = ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) )
    | ( in @ sk__5 @ sk__7 ) ),
    inference('sup+',[status(thm)],[zip_derived_cl57,zip_derived_cl25]) ).

thf(zip_derived_cl25_001,plain,
    ! [X1: $i,X3: $i] :
      ( ( '#_fresh_sk1' @ ( ordered_pair @ X1 @ X3 ) )
      = X1 ),
    inference(inj_rec,[status(thm)],[zip_derived_cl21]) ).

thf(zip_derived_cl112,plain,
    ( ( sk__5
      = ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) )
    | ( in @ sk__5 @ sk__7 ) ),
    inference(demod,[status(thm)],[zip_derived_cl107,zip_derived_cl25]) ).

thf(zip_derived_cl49_002,plain,
    ( ( zip_tseitin_0 @ ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 )
    | ( in @ sk__5 @ sk__7 ) ),
    inference(eq_res,[status(thm)],[zip_derived_cl47]) ).

thf(zip_derived_cl4,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i,X4: $i] :
      ( ( in @ X0 @ X1 )
      | ~ ( zip_tseitin_0 @ X2 @ X0 @ X3 @ X4 @ X1 ) ),
    inference(cnf,[status(esa)],[zf_stmt_0]) ).

thf(zip_derived_cl59,plain,
    ( ( in @ sk__5 @ sk__7 )
    | ( in @ ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ sk__7 ) ),
    inference('sup-',[status(thm)],[zip_derived_cl49,zip_derived_cl4]) ).

thf(zip_derived_cl117,plain,
    ( ( in @ sk__5 @ sk__7 )
    | ( in @ sk__5 @ sk__7 )
    | ( in @ sk__5 @ sk__7 ) ),
    inference('sup+',[status(thm)],[zip_derived_cl112,zip_derived_cl59]) ).

thf(zip_derived_cl121,plain,
    in @ sk__5 @ sk__7,
    inference(simplify,[status(thm)],[zip_derived_cl117]) ).

thf(zip_derived_cl130,plain,
    ( ~ ( in @ sk__6 @ sk__8 )
    | ~ ( in @ ( ordered_pair @ sk__5 @ sk__6 ) @ ( cartesian_product2 @ sk__7 @ sk__8 ) ) ),
    inference(demod,[status(thm)],[zip_derived_cl18,zip_derived_cl121]) ).

thf(zip_derived_cl17,plain,
    ( ( in @ sk__6 @ sk__8 )
    | ( in @ ( ordered_pair @ sk__5 @ sk__6 ) @ ( cartesian_product2 @ sk__7 @ sk__8 ) ) ),
    inference(cnf,[status(esa)],[zf_stmt_3]) ).

thf(zip_derived_cl7_003,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i] :
      ( ~ ( in @ X0 @ X1 )
      | ( zip_tseitin_0 @ ( sk__4 @ X0 @ X2 @ X3 ) @ ( sk__3 @ X0 @ X2 @ X3 ) @ X0 @ X2 @ X3 )
      | ( X1
       != ( cartesian_product2 @ X3 @ X2 ) ) ),
    inference(cnf,[status(esa)],[zf_stmt_2]) ).

thf(zip_derived_cl48,plain,
    ! [X0: $i,X1: $i] :
      ( ( in @ sk__6 @ sk__8 )
      | ( ( cartesian_product2 @ sk__7 @ sk__8 )
       != ( cartesian_product2 @ X1 @ X0 ) )
      | ( zip_tseitin_0 @ ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ X0 @ X1 ) @ ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ X0 @ X1 ) @ ( ordered_pair @ sk__5 @ sk__6 ) @ X0 @ X1 ) ),
    inference('sup-',[status(thm)],[zip_derived_cl17,zip_derived_cl7]) ).

thf(zip_derived_cl50,plain,
    ( ( zip_tseitin_0 @ ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 )
    | ( in @ sk__6 @ sk__8 ) ),
    inference(eq_res,[status(thm)],[zip_derived_cl48]) ).

thf(zip_derived_cl2_004,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i,X4: $i] :
      ( ( X2
        = ( ordered_pair @ X0 @ X1 ) )
      | ~ ( zip_tseitin_0 @ X1 @ X0 @ X2 @ X3 @ X4 ) ),
    inference(cnf,[status(esa)],[zf_stmt_0]) ).

thf(zip_derived_cl142,plain,
    ( ( in @ sk__6 @ sk__8 )
    | ( ( ordered_pair @ sk__5 @ sk__6 )
      = ( ordered_pair @ ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) ) ) ),
    inference('sup-',[status(thm)],[zip_derived_cl50,zip_derived_cl2]) ).

thf(zip_derived_cl22,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i] :
      ( ( X1 = X0 )
      | ( ( ordered_pair @ X3 @ X1 )
       != ( ordered_pair @ X2 @ X0 ) ) ),
    inference(cnf,[status(esa)],[t33_zfmisc_1]) ).

thf(zip_derived_cl27,plain,
    ! [X1: $i,X3: $i] :
      ( ( '#_fresh_sk2' @ ( ordered_pair @ X3 @ X1 ) )
      = X1 ),
    inference(inj_rec,[status(thm)],[zip_derived_cl22]) ).

thf(zip_derived_cl212,plain,
    ( ( ( '#_fresh_sk2' @ ( ordered_pair @ sk__5 @ sk__6 ) )
      = ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) )
    | ( in @ sk__6 @ sk__8 ) ),
    inference('sup+',[status(thm)],[zip_derived_cl142,zip_derived_cl27]) ).

thf(zip_derived_cl27_005,plain,
    ! [X1: $i,X3: $i] :
      ( ( '#_fresh_sk2' @ ( ordered_pair @ X3 @ X1 ) )
      = X1 ),
    inference(inj_rec,[status(thm)],[zip_derived_cl22]) ).

thf(zip_derived_cl220,plain,
    ( ( sk__6
      = ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) )
    | ( in @ sk__6 @ sk__8 ) ),
    inference(demod,[status(thm)],[zip_derived_cl212,zip_derived_cl27]) ).

thf(zip_derived_cl50_006,plain,
    ( ( zip_tseitin_0 @ ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( sk__3 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 )
    | ( in @ sk__6 @ sk__8 ) ),
    inference(eq_res,[status(thm)],[zip_derived_cl48]) ).

thf(zip_derived_cl3,plain,
    ! [X0: $i,X1: $i,X2: $i,X3: $i,X4: $i] :
      ( ( in @ X0 @ X1 )
      | ~ ( zip_tseitin_0 @ X0 @ X2 @ X3 @ X1 @ X4 ) ),
    inference(cnf,[status(esa)],[zf_stmt_0]) ).

thf(zip_derived_cl143,plain,
    ( ( in @ sk__6 @ sk__8 )
    | ( in @ ( sk__4 @ ( ordered_pair @ sk__5 @ sk__6 ) @ sk__8 @ sk__7 ) @ sk__8 ) ),
    inference('sup-',[status(thm)],[zip_derived_cl50,zip_derived_cl3]) ).

thf(zip_derived_cl234,plain,
    ( ( in @ sk__6 @ sk__8 )
    | ( in @ sk__6 @ sk__8 )
    | ( in @ sk__6 @ sk__8 ) ),
    inference('sup+',[status(thm)],[zip_derived_cl220,zip_derived_cl143]) ).

thf(zip_derived_cl238,plain,
    in @ sk__6 @ sk__8,
    inference(simplify,[status(thm)],[zip_derived_cl234]) ).

thf(zip_derived_cl251,plain,
    ~ ( in @ ( ordered_pair @ sk__5 @ sk__6 ) @ ( cartesian_product2 @ sk__7 @ sk__8 ) ),
    inference(demod,[status(thm)],[zip_derived_cl130,zip_derived_cl238]) ).

thf(zip_derived_cl254,plain,
    ( ~ ( in @ sk__5 @ sk__7 )
    | ~ ( in @ sk__6 @ sk__8 ) ),
    inference('sup-',[status(thm)],[zip_derived_cl125,zip_derived_cl251]) ).

thf(zip_derived_cl121_007,plain,
    in @ sk__5 @ sk__7,
    inference(simplify,[status(thm)],[zip_derived_cl117]) ).

thf(zip_derived_cl238_008,plain,
    in @ sk__6 @ sk__8,
    inference(simplify,[status(thm)],[zip_derived_cl234]) ).

thf(zip_derived_cl255,plain,
    $false,
    inference(demod,[status(thm)],[zip_derived_cl254,zip_derived_cl121,zip_derived_cl238]) ).


%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.13  % Problem  : SEU157+1 : TPTP v8.1.2. Released v3.3.0.
% 0.00/0.14  % Command  : python3 /export/starexec/sandbox2/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox2/tmp/tmp.h9iaLV7IdC true
% 0.14/0.35  % Computer : n026.cluster.edu
% 0.14/0.35  % Model    : x86_64 x86_64
% 0.14/0.35  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.14/0.35  % Memory   : 8042.1875MB
% 0.14/0.35  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.14/0.35  % CPULimit : 300
% 0.14/0.35  % WCLimit  : 300
% 0.14/0.35  % DateTime : Wed Aug 23 16:32:46 EDT 2023
% 0.14/0.35  % CPUTime  : 
% 0.14/0.35  % Running portfolio for 300 s
% 0.14/0.35  % File         : /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.14/0.35  % Number of cores: 8
% 0.14/0.36  % Python version: Python 3.6.8
% 0.21/0.36  % Running in FO mode
% 0.21/0.67  % Total configuration time : 435
% 0.21/0.67  % Estimated wc time : 1092
% 0.21/0.67  % Estimated cpu time (7 cpus) : 156.0
% 0.21/0.72  % /export/starexec/sandbox2/solver/bin/fo/fo6_bce.sh running for 75s
% 0.21/0.74  % /export/starexec/sandbox2/solver/bin/fo/fo3_bce.sh running for 75s
% 0.21/0.74  % /export/starexec/sandbox2/solver/bin/fo/fo1_av.sh running for 75s
% 0.21/0.74  % /export/starexec/sandbox2/solver/bin/fo/fo7.sh running for 63s
% 0.21/0.76  % /export/starexec/sandbox2/solver/bin/fo/fo13.sh running for 50s
% 0.21/0.77  % /export/starexec/sandbox2/solver/bin/fo/fo5.sh running for 50s
% 0.21/0.77  % /export/starexec/sandbox2/solver/bin/fo/fo4.sh running for 50s
% 1.20/0.90  % Solved by fo/fo4.sh.
% 1.20/0.90  % done 104 iterations in 0.082s
% 1.20/0.90  % SZS status Theorem for '/export/starexec/sandbox2/benchmark/theBenchmark.p'
% 1.20/0.90  % SZS output start Refutation
% See solution above
% 1.20/0.90  
% 1.20/0.90  
% 1.20/0.90  % Terminating...
% 1.38/1.00  % Runner terminated.
% 1.51/1.02  % Zipperpin 1.5 exiting
%------------------------------------------------------------------------------