%------------------------------------------------------------------------------
% File : Zipperpin---2.1.9999
% Problem : SWC320-1 : TPTP v9.2.0. Released v2.4.0.
% Transfm : none
% Format : tptp:raw
% Command : python3 /export/starexec/sandbox/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox/tmp/tmp.zlx2b9MbY7 true
% Computer : n009.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 Oct 2 04:59:22 PM UTC 2025
% Result : Unsatisfiable 1.12s 1.18s
% Output : Refutation 1.12s
% Verified :
% SZS Type : -
% Comments :
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.08/0.38 % Problem : SWC320-1 : TPTP v9.2.0. Released v2.4.0.
% 0.08/0.40 % Command : python3 /export/starexec/sandbox/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox/tmp/tmp.zlx2b9MbY7 true
% 0.12/0.64 % Computer : n009.cluster.edu
% 0.12/0.64 % Model : x86_64 x86_64
% 0.12/0.64 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.64 % Memory : 8042.1875MB
% 0.12/0.64 % OS : Linux 3.10.0-693.el7.x86_64
% 0.12/0.64 % CPULimit : 300
% 0.12/0.64 % WCLimit : 300
% 0.12/0.64 % DateTime : Wed Oct 1 17:08:08 EDT 2025
% 0.12/0.64 % CPUTime :
% 0.12/0.64 % Running portfolio for 300 s
% 0.12/0.64 % File : /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.12/0.65 % Number of cores: 8
% 0.15/0.66 % Python version: Python 3.6.8
% 0.15/0.66 % Running in FO mode
% 0.16/0.91 % Total configuration time : 435
% 0.16/0.91 % Estimated wc time : 1092
% 0.16/0.91 % Estimated cpu time (7 cpus) : 156.0
% 0.16/1.05 % /export/starexec/sandbox/solver/bin/fo/fo6_bce.sh running for 75s
% 1.02/1.09 % /export/starexec/sandbox/solver/bin/fo/fo1_av.sh running for 75s
% 1.02/1.09 % /export/starexec/sandbox/solver/bin/fo/fo7.sh running for 63s
% 1.02/1.09 % /export/starexec/sandbox/solver/bin/fo/fo3_bce.sh running for 75s
% 1.02/1.11 % /export/starexec/sandbox/solver/bin/fo/fo13.sh running for 50s
% 1.02/1.14 % /export/starexec/sandbox/solver/bin/fo/fo5.sh running for 50s
% 1.12/1.18 % Solved by fo/fo1_av.sh.
% 1.12/1.18 % done 37 iterations in 0.038s
% 1.12/1.18 % SZS status Theorem for '/export/starexec/sandbox/benchmark/theBenchmark.p'
% 1.12/1.18 % SZS output start Refutation
% 1.12/1.18 thf(nil_type, type, nil: $i).
% 1.12/1.18 thf(cons_type, type, cons: $i > $i > $i).
% 1.12/1.18 thf(sk2_type, type, sk2: $i).
% 1.12/1.18 thf(sk6_type, type, sk6: $i).
% 1.12/1.18 thf(sk4_type, type, sk4: $i).
% 1.12/1.18 thf(ssItem_type, type, ssItem: $i > $o).
% 1.12/1.18 thf(sk5_type, type, sk5: $i).
% 1.12/1.18 thf(sk3_type, type, sk3: $i).
% 1.12/1.18 thf(neq_type, type, neq: $i > $i > $o).
% 1.12/1.18 thf(app_type, type, app: $i > $i > $i).
% 1.12/1.18 thf(ssList_type, type, ssList: $i > $o).
% 1.12/1.18 thf(sk1_type, type, sk1: $i).
% 1.12/1.18 thf(co1_14, conjecture, (~( ( neq @ sk2 @ nil ) | ( ( nil ) != ( sk1 ) ) ))).
% 1.12/1.18 thf(zf_stmt_0, negated_conjecture,
% 1.12/1.18 (( neq @ sk2 @ nil ) | ( ( nil ) != ( sk1 ) )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_14])).
% 1.12/1.18 thf(zip_derived_cl198, plain, (( (neq @ sk2 @ nil) | ((nil) != (sk1)))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_0])).
% 1.12/1.18 thf('0', plain, (~ (((nil) = (sk1))) | ( (neq @ sk2 @ nil))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl198])).
% 1.12/1.18 thf(co1_11, conjecture,
% 1.12/1.18 (~( ( ~( neq @ sk4 @ nil ) ) |
% 1.12/1.18 ( ( app @ sk6 @ ( cons @ sk5 @ nil ) ) = ( sk4 ) ) ))).
% 1.12/1.18 thf(zf_stmt_1, negated_conjecture,
% 1.12/1.18 (( ~( neq @ sk4 @ nil ) ) |
% 1.12/1.18 ( ( app @ sk6 @ ( cons @ sk5 @ nil ) ) = ( sk4 ) )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_11])).
% 1.12/1.18 thf(zip_derived_cl195, plain,
% 1.12/1.18 ((~ (neq @ sk4 @ nil) | ((app @ sk6 @ (cons @ sk5 @ nil)) = (sk4)))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_1])).
% 1.12/1.18 thf(zip_derived_cl210, plain,
% 1.12/1.18 ((((app @ sk6 @ (cons @ sk5 @ nil)) = (sk4)))
% 1.12/1.18 <= ((((app @ sk6 @ (cons @ sk5 @ nil)) = (sk4))))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl195])).
% 1.12/1.18 thf(co1_5, conjecture, (( sk2 ) != ( sk4 ))).
% 1.12/1.18 thf(zf_stmt_2, negated_conjecture, (( sk2 ) = ( sk4 )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_5])).
% 1.12/1.18 thf(zip_derived_cl189, plain, (((sk2) = (sk4))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_2])).
% 1.12/1.18 thf(zip_derived_cl232, plain,
% 1.12/1.18 ((((app @ sk6 @ (cons @ sk5 @ nil)) = (sk2)))
% 1.12/1.18 <= ((((app @ sk6 @ (cons @ sk5 @ nil)) = (sk4))))),
% 1.12/1.18 inference('demod', [status(thm)], [zip_derived_cl210, zip_derived_cl189])).
% 1.12/1.18 thf(co1_13, conjecture,
% 1.12/1.18 (~( ( ( app @ B @ ( cons @ A @ nil ) ) != ( sk2 ) ) |
% 1.12/1.18 ( ( app @ ( cons @ A @ nil ) @ B ) != ( sk1 ) ) |
% 1.12/1.18 ( ~( ssList @ B ) ) | ( ~( ssItem @ A ) ) | ( ( nil ) = ( sk2 ) ) ))).
% 1.12/1.18 thf(zf_stmt_3, negated_conjecture,
% 1.12/1.18 (( ( app @ B @ ( cons @ A @ nil ) ) != ( sk2 ) ) |
% 1.12/1.18 ( ( app @ ( cons @ A @ nil ) @ B ) != ( sk1 ) ) | ( ~( ssList @ B ) ) |
% 1.12/1.18 ( ~( ssItem @ A ) ) | ( ( nil ) = ( sk2 ) )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_13])).
% 1.12/1.18 thf(zip_derived_cl197, plain,
% 1.12/1.18 (![X0 : $i, X1 : $i]:
% 1.12/1.18 (((app @ X0 @ (cons @ X1 @ nil)) != (sk2))
% 1.12/1.18 | ((app @ (cons @ X1 @ nil) @ X0) != (sk1))
% 1.12/1.18 | ~ (ssList @ X0)
% 1.12/1.18 | ~ (ssItem @ X1)
% 1.12/1.18 | ((nil) = (sk2)))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_3])).
% 1.12/1.18 thf(zip_derived_cl214, plain,
% 1.12/1.18 ((![X0 : $i, X1 : $i]:
% 1.12/1.18 (~ (ssList @ X0)
% 1.12/1.18 | ~ (ssItem @ X1)
% 1.12/1.18 | ((app @ X0 @ (cons @ X1 @ nil)) != (sk2))
% 1.12/1.18 | ((app @ (cons @ X1 @ nil) @ X0) != (sk1))))
% 1.12/1.18 <= ((![X0 : $i, X1 : $i]:
% 1.12/1.18 (~ (ssList @ X0)
% 1.12/1.18 | ~ (ssItem @ X1)
% 1.12/1.18 | ((app @ X0 @ (cons @ X1 @ nil)) != (sk2))
% 1.12/1.18 | ((app @ (cons @ X1 @ nil) @ X0) != (sk1)))))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl197])).
% 1.12/1.18 thf(zip_derived_cl236, plain,
% 1.12/1.18 (((~ (ssList @ sk6)
% 1.12/1.18 | ~ (ssItem @ sk5)
% 1.12/1.18 | ((sk2) != (sk2))
% 1.12/1.18 | ((app @ (cons @ sk5 @ nil) @ sk6) != (sk1))))
% 1.12/1.18 <= ((((app @ sk6 @ (cons @ sk5 @ nil)) = (sk4))) &
% 1.12/1.18 (![X0 : $i, X1 : $i]:
% 1.12/1.18 (~ (ssList @ X0)
% 1.12/1.18 | ~ (ssItem @ X1)
% 1.12/1.18 | ((app @ X0 @ (cons @ X1 @ nil)) != (sk2))
% 1.12/1.18 | ((app @ (cons @ X1 @ nil) @ X0) != (sk1)))))),
% 1.12/1.18 inference('s_sup-', [status(thm)], [zip_derived_cl232, zip_derived_cl214])).
% 1.12/1.18 thf(zip_derived_cl237, plain,
% 1.12/1.18 (((((app @ (cons @ sk5 @ nil) @ sk6) != (sk1))
% 1.12/1.18 | ~ (ssItem @ sk5)
% 1.12/1.18 | ~ (ssList @ sk6)))
% 1.12/1.18 <= ((((app @ sk6 @ (cons @ sk5 @ nil)) = (sk4))) &
% 1.12/1.18 (![X0 : $i, X1 : $i]:
% 1.12/1.18 (~ (ssList @ X0)
% 1.12/1.18 | ~ (ssItem @ X1)
% 1.12/1.18 | ((app @ X0 @ (cons @ X1 @ nil)) != (sk2))
% 1.12/1.18 | ((app @ (cons @ X1 @ nil) @ X0) != (sk1)))))),
% 1.12/1.18 inference('simplify', [status(thm)], [zip_derived_cl236])).
% 1.12/1.18 thf('1', plain,
% 1.12/1.18 (~ (((app @ (cons @ sk5 @ nil) @ sk6) = (sk1))) |
% 1.12/1.18 ~ (((app @ sk6 @ (cons @ sk5 @ nil)) = (sk4))) |
% 1.12/1.18 ~
% 1.12/1.18 (![X0 : $i, X1 : $i]:
% 1.12/1.18 (~ (ssList @ X0)
% 1.12/1.18 | ~ (ssItem @ X1)
% 1.12/1.18 | ((app @ X0 @ (cons @ X1 @ nil)) != (sk2))
% 1.12/1.18 | ((app @ (cons @ X1 @ nil) @ X0) != (sk1)))) |
% 1.12/1.18 ~ ( (ssList @ sk6)) | ~ ( (ssItem @ sk5))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl237])).
% 1.12/1.18 thf(co1_7, conjecture, (~( ( ( nil ) != ( sk4 ) ) | ( ( nil ) = ( sk3 ) ) ))).
% 1.12/1.18 thf(zf_stmt_4, negated_conjecture,
% 1.12/1.18 (( ( nil ) != ( sk4 ) ) | ( ( nil ) = ( sk3 ) )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_7])).
% 1.12/1.18 thf(zip_derived_cl191, plain, ((((nil) != (sk4)) | ((nil) = (sk3)))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_4])).
% 1.12/1.18 thf(zip_derived_cl203, plain, ((((nil) = (sk3))) <= ((((nil) = (sk3))))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl191])).
% 1.12/1.18 thf(co1_6, conjecture, (( sk1 ) != ( sk3 ))).
% 1.12/1.18 thf(zf_stmt_5, negated_conjecture, (( sk1 ) = ( sk3 )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_6])).
% 1.12/1.18 thf(zip_derived_cl190, plain, (((sk1) = (sk3))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_5])).
% 1.12/1.18 thf(zip_derived_cl225, plain, ((((sk1) = (nil))) <= ((((nil) = (sk3))))),
% 1.12/1.18 inference('s_sup+', [status(thm)], [zip_derived_cl203, zip_derived_cl190])).
% 1.12/1.18 thf(zip_derived_cl217, plain, ((((nil) != (sk1))) <= (~ (((nil) = (sk1))))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl198])).
% 1.12/1.18 thf(zip_derived_cl229, plain,
% 1.12/1.18 ((((nil) != (nil))) <= (~ (((nil) = (sk1))) & (((nil) = (sk3))))),
% 1.12/1.18 inference('s_sup-', [status(thm)], [zip_derived_cl225, zip_derived_cl217])).
% 1.12/1.18 thf('2', plain, (~ (((nil) = (sk3))) | (((nil) = (sk1)))),
% 1.12/1.18 inference('simplify', [status(thm)], [zip_derived_cl229])).
% 1.12/1.18 thf('3', plain,
% 1.12/1.18 ((((nil) = (sk2))) |
% 1.12/1.18 (![X0 : $i, X1 : $i]:
% 1.12/1.18 (~ (ssList @ X0)
% 1.12/1.18 | ~ (ssItem @ X1)
% 1.12/1.18 | ((app @ X0 @ (cons @ X1 @ nil)) != (sk2))
% 1.12/1.18 | ((app @ (cons @ X1 @ nil) @ X0) != (sk1))))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl197])).
% 1.12/1.18 thf(co1_15, conjecture,
% 1.12/1.18 (~( ( ( app @ B @ ( cons @ A @ nil ) ) != ( sk2 ) ) |
% 1.12/1.18 ( ( app @ ( cons @ A @ nil ) @ B ) != ( sk1 ) ) |
% 1.12/1.18 ( ~( ssList @ B ) ) | ( ~( ssItem @ A ) ) | ( ( nil ) != ( sk1 ) ) ))).
% 1.12/1.18 thf(zf_stmt_6, negated_conjecture,
% 1.12/1.18 (( ( app @ B @ ( cons @ A @ nil ) ) != ( sk2 ) ) |
% 1.12/1.18 ( ( app @ ( cons @ A @ nil ) @ B ) != ( sk1 ) ) | ( ~( ssList @ B ) ) |
% 1.12/1.18 ( ~( ssItem @ A ) ) | ( ( nil ) != ( sk1 ) )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_15])).
% 1.12/1.18 thf(zip_derived_cl199, plain,
% 1.12/1.18 (![X0 : $i, X1 : $i]:
% 1.12/1.18 (((app @ X0 @ (cons @ X1 @ nil)) != (sk2))
% 1.12/1.18 | ((app @ (cons @ X1 @ nil) @ X0) != (sk1))
% 1.12/1.18 | ~ (ssList @ X0)
% 1.12/1.18 | ~ (ssItem @ X1)
% 1.12/1.18 | ((nil) != (sk1)))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_6])).
% 1.12/1.18 thf('4', plain,
% 1.12/1.18 ((![X0 : $i, X1 : $i]:
% 1.12/1.18 (~ (ssList @ X0)
% 1.12/1.18 | ~ (ssItem @ X1)
% 1.12/1.18 | ((app @ X0 @ (cons @ X1 @ nil)) != (sk2))
% 1.12/1.18 | ((app @ (cons @ X1 @ nil) @ X0) != (sk1)))) |
% 1.12/1.18 ~ (((nil) = (sk1)))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl199])).
% 1.12/1.18 thf(co1_8, conjecture, (~( ( ~( neq @ sk4 @ nil ) ) | ( ssItem @ sk5 ) ))).
% 1.12/1.18 thf(zf_stmt_7, negated_conjecture,
% 1.12/1.18 (( ~( neq @ sk4 @ nil ) ) | ( ssItem @ sk5 )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_8])).
% 1.12/1.18 thf(zip_derived_cl192, plain, ((~ (neq @ sk4 @ nil) | (ssItem @ sk5))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_7])).
% 1.12/1.18 thf('5', plain, (( (ssItem @ sk5)) | ~ ( (neq @ sk4 @ nil))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl192])).
% 1.12/1.18 thf(co1_9, conjecture, (~( ( ~( neq @ sk4 @ nil ) ) | ( ssList @ sk6 ) ))).
% 1.12/1.18 thf(zf_stmt_8, negated_conjecture,
% 1.12/1.18 (( ~( neq @ sk4 @ nil ) ) | ( ssList @ sk6 )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_9])).
% 1.12/1.18 thf(zip_derived_cl193, plain, ((~ (neq @ sk4 @ nil) | (ssList @ sk6))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_8])).
% 1.12/1.18 thf('6', plain, (( (ssList @ sk6)) | ~ ( (neq @ sk4 @ nil))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl193])).
% 1.12/1.18 thf(co1_10, conjecture,
% 1.12/1.18 (~( ( ~( neq @ sk4 @ nil ) ) |
% 1.12/1.18 ( ( app @ ( cons @ sk5 @ nil ) @ sk6 ) = ( sk3 ) ) ))).
% 1.12/1.18 thf(zf_stmt_9, negated_conjecture,
% 1.12/1.18 (( ~( neq @ sk4 @ nil ) ) |
% 1.12/1.18 ( ( app @ ( cons @ sk5 @ nil ) @ sk6 ) = ( sk3 ) )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_10])).
% 1.12/1.18 thf(zip_derived_cl194, plain,
% 1.12/1.18 ((~ (neq @ sk4 @ nil) | ((app @ (cons @ sk5 @ nil) @ sk6) = (sk3)))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_9])).
% 1.12/1.18 thf('7', plain,
% 1.12/1.18 ((((app @ (cons @ sk5 @ nil) @ sk6) = (sk3))) | ~ ( (neq @ sk4 @ nil))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl194])).
% 1.12/1.18 thf('8', plain,
% 1.12/1.18 ((((app @ sk6 @ (cons @ sk5 @ nil)) = (sk4))) | ~ ( (neq @ sk4 @ nil))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl195])).
% 1.12/1.18 thf(zip_derived_cl208, plain,
% 1.12/1.18 ((((app @ (cons @ sk5 @ nil) @ sk6) = (sk3)))
% 1.12/1.18 <= ((((app @ (cons @ sk5 @ nil) @ sk6) = (sk3))))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl194])).
% 1.12/1.18 thf(zip_derived_cl190, plain, (((sk1) = (sk3))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_5])).
% 1.12/1.18 thf(zip_derived_cl231, plain,
% 1.12/1.18 ((((app @ (cons @ sk5 @ nil) @ sk6) = (sk1)))
% 1.12/1.18 <= ((((app @ (cons @ sk5 @ nil) @ sk6) = (sk3))))),
% 1.12/1.18 inference('demod', [status(thm)], [zip_derived_cl208, zip_derived_cl190])).
% 1.12/1.18 thf(zip_derived_cl239, plain,
% 1.12/1.18 ((((app @ (cons @ sk5 @ nil) @ sk6) != (sk1)))
% 1.12/1.18 <= (~ (((app @ (cons @ sk5 @ nil) @ sk6) = (sk1))))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl237])).
% 1.12/1.18 thf(zip_derived_cl242, plain,
% 1.12/1.18 ((((sk1) != (sk1)))
% 1.12/1.18 <= (~ (((app @ (cons @ sk5 @ nil) @ sk6) = (sk1))) &
% 1.12/1.18 (((app @ (cons @ sk5 @ nil) @ sk6) = (sk3))))),
% 1.12/1.18 inference('s_sup-', [status(thm)], [zip_derived_cl231, zip_derived_cl239])).
% 1.12/1.18 thf('9', plain,
% 1.12/1.18 ((((app @ (cons @ sk5 @ nil) @ sk6) = (sk1))) |
% 1.12/1.18 ~ (((app @ (cons @ sk5 @ nil) @ sk6) = (sk3)))),
% 1.12/1.18 inference('simplify', [status(thm)], [zip_derived_cl242])).
% 1.12/1.18 thf(co1_12, conjecture, (~( ( neq @ sk2 @ nil ) | ( ( nil ) = ( sk2 ) ) ))).
% 1.12/1.18 thf(zf_stmt_10, negated_conjecture,
% 1.12/1.18 (( neq @ sk2 @ nil ) | ( ( nil ) = ( sk2 ) )),
% 1.12/1.18 inference('cnf.neg', [status(esa)], [co1_12])).
% 1.12/1.18 thf(zip_derived_cl196, plain, (( (neq @ sk2 @ nil) | ((nil) = (sk2)))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_10])).
% 1.12/1.18 thf(zip_derived_cl212, plain,
% 1.12/1.18 (( (neq @ sk2 @ nil)) <= (( (neq @ sk2 @ nil)))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl196])).
% 1.12/1.18 thf(zip_derived_cl205, plain,
% 1.12/1.18 ((~ (neq @ sk4 @ nil)) <= (~ ( (neq @ sk4 @ nil)))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl192])).
% 1.12/1.18 thf(zip_derived_cl189, plain, (((sk2) = (sk4))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_2])).
% 1.12/1.18 thf(zip_derived_cl221, plain,
% 1.12/1.18 ((~ (neq @ sk2 @ nil)) <= (~ ( (neq @ sk4 @ nil)))),
% 1.12/1.18 inference('demod', [status(thm)], [zip_derived_cl205, zip_derived_cl189])).
% 1.12/1.18 thf('10', plain, (~ ( (neq @ sk2 @ nil)) | ( (neq @ sk4 @ nil))),
% 1.12/1.18 inference('s_sup-', [status(thm)], [zip_derived_cl212, zip_derived_cl221])).
% 1.12/1.18 thf('11', plain, ((((nil) = (sk2))) | ( (neq @ sk2 @ nil))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl196])).
% 1.12/1.18 thf(zip_derived_cl213, plain, ((((nil) = (sk2))) <= ((((nil) = (sk2))))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl196])).
% 1.12/1.18 thf(zip_derived_cl202, plain, ((((nil) != (sk4))) <= (~ (((nil) = (sk4))))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl191])).
% 1.12/1.18 thf(zip_derived_cl189, plain, (((sk2) = (sk4))),
% 1.12/1.18 inference('cnf', [status(esa)], [zf_stmt_2])).
% 1.12/1.18 thf(zip_derived_cl220, plain, ((((nil) != (sk2))) <= (~ (((nil) = (sk4))))),
% 1.12/1.18 inference('demod', [status(thm)], [zip_derived_cl202, zip_derived_cl189])).
% 1.12/1.18 thf(zip_derived_cl226, plain,
% 1.12/1.18 ((((nil) != (nil))) <= (~ (((nil) = (sk4))) & (((nil) = (sk2))))),
% 1.12/1.18 inference('s_sup-', [status(thm)], [zip_derived_cl213, zip_derived_cl220])).
% 1.12/1.18 thf('12', plain, ((((nil) = (sk4))) | ~ (((nil) = (sk2)))),
% 1.12/1.18 inference('simplify', [status(thm)], [zip_derived_cl226])).
% 1.12/1.18 thf('13', plain, (~ (((nil) = (sk4))) | (((nil) = (sk3)))),
% 1.12/1.18 inference('split', [status(esa)], [zip_derived_cl191])).
% 1.12/1.18 thf(zip_derived_cl245, plain, ($false),
% 1.12/1.18 inference('sat_resolution*', [status(thm)],
% 1.12/1.18 ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11',
% 1.12/1.18 '12', '13'])).
% 1.12/1.18
% 1.12/1.18 % SZS output end Refutation
% 1.12/1.18
% 1.12/1.18
% 1.12/1.18 % Terminating...
% 1.58/1.34 % Runner terminated.
% 1.62/1.36 % Zipperpin 1.5 exiting
%------------------------------------------------------------------------------