TSTP Solution File: LCL101-1 by Zipperpin---2.1.9999

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Zipperpin---2.1.9999
% Problem  : LCL101-1 : TPTP v8.1.2. Released v1.0.0.
% Transfm  : NO INFORMATION
% Format   : NO INFORMATION
% Command  : python3 /export/starexec/sandbox/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox/tmp/tmp.YkCG3lLEZD true

% Computer : n032.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 08:58:11 EDT 2023

% Result   : Unsatisfiable 0.17s 0.63s
% Output   : Refutation 0.17s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.11  % Problem  : LCL101-1 : TPTP v8.1.2. Released v1.0.0.
% 0.00/0.12  % Command  : python3 /export/starexec/sandbox/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox/tmp/tmp.YkCG3lLEZD true
% 0.12/0.32  % Computer : n032.cluster.edu
% 0.12/0.32  % Model    : x86_64 x86_64
% 0.12/0.32  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.32  % Memory   : 8042.1875MB
% 0.12/0.32  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.12/0.32  % CPULimit : 300
% 0.12/0.32  % WCLimit  : 300
% 0.12/0.32  % DateTime : Thu Aug 24 18:52:12 EDT 2023
% 0.12/0.32  % CPUTime  : 
% 0.12/0.32  % Running portfolio for 300 s
% 0.12/0.32  % File         : /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.12/0.32  % Number of cores: 8
% 0.12/0.32  % Python version: Python 3.6.8
% 0.12/0.32  % Running in FO mode
% 0.17/0.53  % Total configuration time : 435
% 0.17/0.53  % Estimated wc time : 1092
% 0.17/0.53  % Estimated cpu time (7 cpus) : 156.0
% 0.17/0.58  % /export/starexec/sandbox/solver/bin/fo/fo6_bce.sh running for 75s
% 0.17/0.58  % /export/starexec/sandbox/solver/bin/fo/fo3_bce.sh running for 75s
% 0.17/0.58  % /export/starexec/sandbox/solver/bin/fo/fo1_av.sh running for 75s
% 0.17/0.60  % /export/starexec/sandbox/solver/bin/fo/fo7.sh running for 63s
% 0.17/0.60  % /export/starexec/sandbox/solver/bin/fo/fo13.sh running for 50s
% 0.17/0.60  % /export/starexec/sandbox/solver/bin/fo/fo5.sh running for 50s
% 0.17/0.61  % /export/starexec/sandbox/solver/bin/fo/fo4.sh running for 50s
% 0.17/0.63  % Solved by fo/fo6_bce.sh.
% 0.17/0.63  % BCE start: 4
% 0.17/0.63  % BCE eliminated: 0
% 0.17/0.63  % PE start: 4
% 0.17/0.63  logic: neq
% 0.17/0.63  % PE eliminated: 0
% 0.17/0.63  % done 27 iterations in 0.030s
% 0.17/0.63  % SZS status Theorem for '/export/starexec/sandbox/benchmark/theBenchmark.p'
% 0.17/0.63  % SZS output start Refutation
% 0.17/0.63  thf(c_type, type, c: $i).
% 0.17/0.63  thf(is_a_theorem_type, type, is_a_theorem: $i > $o).
% 0.17/0.63  thf(equivalent_type, type, equivalent: $i > $i > $i).
% 0.17/0.63  thf(b_type, type, b: $i).
% 0.17/0.63  thf(a_type, type, a: $i).
% 0.17/0.63  thf(e_type, type, e: $i).
% 0.17/0.63  thf(prove_p_1, conjecture,
% 0.17/0.63    (is_a_theorem @
% 0.17/0.63     ( equivalent @
% 0.17/0.63       ( equivalent @ ( equivalent @ a @ b ) @ c ) @ 
% 0.17/0.63       ( equivalent @
% 0.17/0.63         ( equivalent @ e @ b ) @ ( equivalent @ ( equivalent @ a @ e ) @ c ) ) ))).
% 0.17/0.63  thf(zf_stmt_0, negated_conjecture,
% 0.17/0.63    (~( is_a_theorem @
% 0.17/0.63        ( equivalent @
% 0.17/0.63          ( equivalent @ ( equivalent @ a @ b ) @ c ) @ 
% 0.17/0.63          ( equivalent @
% 0.17/0.63            ( equivalent @ e @ b ) @ 
% 0.17/0.63            ( equivalent @ ( equivalent @ a @ e ) @ c ) ) ) )),
% 0.17/0.63    inference('cnf.neg', [status(esa)], [prove_p_1])).
% 0.17/0.63  thf(zip_derived_cl3, plain,
% 0.17/0.63      (~ (is_a_theorem @ 
% 0.17/0.63          (equivalent @ (equivalent @ (equivalent @ a @ b) @ c) @ 
% 0.17/0.63           (equivalent @ (equivalent @ e @ b) @ 
% 0.17/0.63            (equivalent @ (equivalent @ a @ e) @ c))))),
% 0.17/0.63      inference('cnf', [status(esa)], [zf_stmt_0])).
% 0.17/0.63  thf(p_4, axiom,
% 0.17/0.63    (is_a_theorem @
% 0.17/0.63     ( equivalent @
% 0.17/0.63       X @ 
% 0.17/0.63       ( equivalent @
% 0.17/0.63         ( equivalent @
% 0.17/0.63           ( equivalent @ ( equivalent @ Y @ Z ) @ ( equivalent @ Y @ U ) ) @ 
% 0.17/0.63           ( equivalent @ Z @ U ) ) @ 
% 0.17/0.63         X ) ))).
% 0.17/0.63  thf(zip_derived_cl2, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ X0 @ 
% 0.17/0.63            (equivalent @ 
% 0.17/0.63             (equivalent @ 
% 0.17/0.63              (equivalent @ (equivalent @ X1 @ X2) @ (equivalent @ X1 @ X3)) @ 
% 0.17/0.63              (equivalent @ X2 @ X3)) @ 
% 0.17/0.63             X0)))),
% 0.17/0.63      inference('cnf', [status(esa)], [p_4])).
% 0.17/0.63  thf(zip_derived_cl2, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ X0 @ 
% 0.17/0.63            (equivalent @ 
% 0.17/0.63             (equivalent @ 
% 0.17/0.63              (equivalent @ (equivalent @ X1 @ X2) @ (equivalent @ X1 @ X3)) @ 
% 0.17/0.63              (equivalent @ X2 @ X3)) @ 
% 0.17/0.63             X0)))),
% 0.17/0.63      inference('cnf', [status(esa)], [p_4])).
% 0.17/0.63  thf(condensed_detachment, axiom,
% 0.17/0.63    (( ~( is_a_theorem @ ( equivalent @ X @ Y ) ) ) | 
% 0.17/0.63     ( ~( is_a_theorem @ X ) ) | ( is_a_theorem @ Y ))).
% 0.17/0.63  thf(zip_derived_cl0, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ (equivalent @ X0 @ X1))
% 0.17/0.63          | ~ (is_a_theorem @ X0)
% 0.17/0.63          |  (is_a_theorem @ X1))),
% 0.17/0.63      inference('cnf', [status(esa)], [condensed_detachment])).
% 0.17/0.63  thf(zip_derived_cl5, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ X0)
% 0.17/0.63          |  (is_a_theorem @ 
% 0.17/0.63              (equivalent @ 
% 0.17/0.63               (equivalent @ 
% 0.17/0.63                (equivalent @ (equivalent @ X3 @ X2) @ (equivalent @ X3 @ X1)) @ 
% 0.17/0.63                (equivalent @ X2 @ X1)) @ 
% 0.17/0.63               X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl2, zip_derived_cl0])).
% 0.17/0.63  thf(zip_derived_cl2, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ X0 @ 
% 0.17/0.63            (equivalent @ 
% 0.17/0.63             (equivalent @ 
% 0.17/0.63              (equivalent @ (equivalent @ X1 @ X2) @ (equivalent @ X1 @ X3)) @ 
% 0.17/0.63              (equivalent @ X2 @ X3)) @ 
% 0.17/0.63             X0)))),
% 0.17/0.63      inference('cnf', [status(esa)], [p_4])).
% 0.17/0.63  thf(lg_2, axiom,
% 0.17/0.63    (is_a_theorem @
% 0.17/0.63     ( equivalent @
% 0.17/0.63       ( equivalent @
% 0.17/0.63         ( equivalent @
% 0.17/0.63           ( equivalent @ ( equivalent @ X @ Y ) @ ( equivalent @ X @ Z ) ) @ 
% 0.17/0.63           ( equivalent @ Y @ Z ) ) @ 
% 0.17/0.63         U ) @ 
% 0.17/0.63       U ))).
% 0.17/0.63  thf(zip_derived_cl1, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ 
% 0.17/0.63            (equivalent @ 
% 0.17/0.63             (equivalent @ 
% 0.17/0.63              (equivalent @ (equivalent @ X0 @ X1) @ (equivalent @ X0 @ X2)) @ 
% 0.17/0.63              (equivalent @ X1 @ X2)) @ 
% 0.17/0.63             X3) @ 
% 0.17/0.63            X3))),
% 0.17/0.63      inference('cnf', [status(esa)], [lg_2])).
% 0.17/0.63  thf(zip_derived_cl0, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ (equivalent @ X0 @ X1))
% 0.17/0.63          | ~ (is_a_theorem @ X0)
% 0.17/0.63          |  (is_a_theorem @ X1))),
% 0.17/0.63      inference('cnf', [status(esa)], [condensed_detachment])).
% 0.17/0.63  thf(zip_derived_cl4, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ 
% 0.17/0.63             (equivalent @ 
% 0.17/0.63              (equivalent @ 
% 0.17/0.63               (equivalent @ (equivalent @ X3 @ X2) @ (equivalent @ X3 @ X1)) @ 
% 0.17/0.63               (equivalent @ X2 @ X1)) @ 
% 0.17/0.63              X0))
% 0.17/0.63          |  (is_a_theorem @ X0))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl1, zip_derived_cl0])).
% 0.17/0.63  thf(zip_derived_cl6, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i, X4 : $i, X5 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ 
% 0.17/0.63            (equivalent @ 
% 0.17/0.63             (equivalent @ (equivalent @ X5 @ X4) @ (equivalent @ X5 @ X3)) @ 
% 0.17/0.63             (equivalent @ X4 @ X3)) @ 
% 0.17/0.63            (equivalent @ 
% 0.17/0.63             (equivalent @ (equivalent @ X2 @ X1) @ (equivalent @ X2 @ X0)) @ 
% 0.17/0.63             (equivalent @ X1 @ X0))))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl2, zip_derived_cl4])).
% 0.17/0.63  thf(zip_derived_cl4, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ 
% 0.17/0.63             (equivalent @ 
% 0.17/0.63              (equivalent @ 
% 0.17/0.63               (equivalent @ (equivalent @ X3 @ X2) @ (equivalent @ X3 @ X1)) @ 
% 0.17/0.63               (equivalent @ X2 @ X1)) @ 
% 0.17/0.63              X0))
% 0.17/0.63          |  (is_a_theorem @ X0))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl1, zip_derived_cl0])).
% 0.17/0.63  thf(zip_derived_cl10, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ 
% 0.17/0.63            (equivalent @ (equivalent @ X2 @ X1) @ (equivalent @ X2 @ X0)) @ 
% 0.17/0.63            (equivalent @ X1 @ X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl6, zip_derived_cl4])).
% 0.17/0.63  thf(zip_derived_cl0, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ (equivalent @ X0 @ X1))
% 0.17/0.63          | ~ (is_a_theorem @ X0)
% 0.17/0.63          |  (is_a_theorem @ X1))),
% 0.17/0.63      inference('cnf', [status(esa)], [condensed_detachment])).
% 0.17/0.63  thf(zip_derived_cl11, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ 
% 0.17/0.63             (equivalent @ (equivalent @ X2 @ X1) @ (equivalent @ X2 @ X0)))
% 0.17/0.63          |  (is_a_theorem @ (equivalent @ X1 @ X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl10, zip_derived_cl0])).
% 0.17/0.63  thf(zip_derived_cl15, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ 
% 0.17/0.63             (equivalent @ 
% 0.17/0.63              (equivalent @ (equivalent @ X2 @ X3) @ (equivalent @ X2 @ X1)) @ 
% 0.17/0.63              X0))
% 0.17/0.63          |  (is_a_theorem @ (equivalent @ (equivalent @ X3 @ X1) @ X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl5, zip_derived_cl11])).
% 0.17/0.63  thf(zip_derived_cl24, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i, X4 : $i, X5 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ (equivalent @ X2 @ X0) @ 
% 0.17/0.63            (equivalent @ 
% 0.17/0.63             (equivalent @ 
% 0.17/0.63              (equivalent @ (equivalent @ X5 @ X4) @ (equivalent @ X5 @ X3)) @ 
% 0.17/0.63              (equivalent @ X4 @ X3)) @ 
% 0.17/0.63             (equivalent @ (equivalent @ X1 @ X2) @ (equivalent @ X1 @ X0)))))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl2, zip_derived_cl15])).
% 0.17/0.63  thf(zip_derived_cl10, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ 
% 0.17/0.63            (equivalent @ (equivalent @ X2 @ X1) @ (equivalent @ X2 @ X0)) @ 
% 0.17/0.63            (equivalent @ X1 @ X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl6, zip_derived_cl4])).
% 0.17/0.63  thf(zip_derived_cl6, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i, X4 : $i, X5 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ 
% 0.17/0.63            (equivalent @ 
% 0.17/0.63             (equivalent @ (equivalent @ X5 @ X4) @ (equivalent @ X5 @ X3)) @ 
% 0.17/0.63             (equivalent @ X4 @ X3)) @ 
% 0.17/0.63            (equivalent @ 
% 0.17/0.63             (equivalent @ (equivalent @ X2 @ X1) @ (equivalent @ X2 @ X0)) @ 
% 0.17/0.63             (equivalent @ X1 @ X0))))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl2, zip_derived_cl4])).
% 0.17/0.63  thf(zip_derived_cl11, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ 
% 0.17/0.63             (equivalent @ (equivalent @ X2 @ X1) @ (equivalent @ X2 @ X0)))
% 0.17/0.63          |  (is_a_theorem @ (equivalent @ X1 @ X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl10, zip_derived_cl0])).
% 0.17/0.63  thf(zip_derived_cl16, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ (equivalent @ X1 @ X0) @ (equivalent @ X1 @ X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl6, zip_derived_cl11])).
% 0.17/0.63  thf(zip_derived_cl11, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ 
% 0.17/0.63             (equivalent @ (equivalent @ X2 @ X1) @ (equivalent @ X2 @ X0)))
% 0.17/0.63          |  (is_a_theorem @ (equivalent @ X1 @ X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl10, zip_derived_cl0])).
% 0.17/0.63  thf(zip_derived_cl19, plain,
% 0.17/0.63      (![X0 : $i]:  (is_a_theorem @ (equivalent @ X0 @ X0))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl16, zip_derived_cl11])).
% 0.17/0.63  thf(zip_derived_cl15, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ 
% 0.17/0.63             (equivalent @ 
% 0.17/0.63              (equivalent @ (equivalent @ X2 @ X3) @ (equivalent @ X2 @ X1)) @ 
% 0.17/0.63              X0))
% 0.17/0.63          |  (is_a_theorem @ (equivalent @ (equivalent @ X3 @ X1) @ X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl5, zip_derived_cl11])).
% 0.17/0.63  thf(zip_derived_cl23, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ (equivalent @ X2 @ X0) @ 
% 0.17/0.63            (equivalent @ (equivalent @ X1 @ X2) @ (equivalent @ X1 @ X0))))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl19, zip_derived_cl15])).
% 0.17/0.63  thf(zip_derived_cl0, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ (equivalent @ X0 @ X1))
% 0.17/0.63          | ~ (is_a_theorem @ X0)
% 0.17/0.63          |  (is_a_theorem @ X1))),
% 0.17/0.63      inference('cnf', [status(esa)], [condensed_detachment])).
% 0.17/0.63  thf(zip_derived_cl27, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ (equivalent @ X2 @ X0))
% 0.17/0.63          |  (is_a_theorem @ 
% 0.17/0.63              (equivalent @ (equivalent @ X1 @ X2) @ (equivalent @ X1 @ X0))))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl23, zip_derived_cl0])).
% 0.17/0.63  thf(zip_derived_cl0, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ (equivalent @ X0 @ X1))
% 0.17/0.63          | ~ (is_a_theorem @ X0)
% 0.17/0.63          |  (is_a_theorem @ X1))),
% 0.17/0.63      inference('cnf', [status(esa)], [condensed_detachment])).
% 0.17/0.63  thf(zip_derived_cl33, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ (equivalent @ X2 @ X0))
% 0.17/0.63          | ~ (is_a_theorem @ (equivalent @ X1 @ X2))
% 0.17/0.63          |  (is_a_theorem @ (equivalent @ X1 @ X0)))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl27, zip_derived_cl0])).
% 0.17/0.63  thf(zip_derived_cl46, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63         (~ (is_a_theorem @ 
% 0.17/0.63             (equivalent @ X3 @ 
% 0.17/0.63              (equivalent @ (equivalent @ X2 @ X1) @ (equivalent @ X2 @ X0))))
% 0.17/0.63          |  (is_a_theorem @ (equivalent @ X3 @ (equivalent @ X1 @ X0))))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl10, zip_derived_cl33])).
% 0.17/0.63  thf(zip_derived_cl69, plain,
% 0.17/0.63      (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.17/0.63          (is_a_theorem @ 
% 0.17/0.63           (equivalent @ (equivalent @ (equivalent @ X2 @ X3) @ X0) @ 
% 0.17/0.63            (equivalent @ (equivalent @ X1 @ X3) @ 
% 0.17/0.63             (equivalent @ (equivalent @ X2 @ X1) @ X0))))),
% 0.17/0.63      inference('s_sup-', [status(thm)], [zip_derived_cl24, zip_derived_cl46])).
% 0.17/0.63  thf(zip_derived_cl79, plain, ($false),
% 0.17/0.63      inference('demod', [status(thm)], [zip_derived_cl3, zip_derived_cl69])).
% 0.17/0.63  
% 0.17/0.63  % SZS output end Refutation
% 0.17/0.63  
% 0.17/0.63  
% 0.17/0.63  % Terminating...
% 1.85/0.78  % Runner terminated.
% 1.85/0.79  % Zipperpin 1.5 exiting
%------------------------------------------------------------------------------