TSTP Solution File: NUM394+1 by Otter---3.3

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Otter---3.3
% Problem  : NUM394+1 : TPTP v8.1.0. Released v3.2.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : otter-tptp-script %s

% Computer : n027.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 : Wed Jul 27 13:08:14 EDT 2022

% Result   : Theorem 1.92s 2.11s
% Output   : Refutation 1.92s
% Verified : 
% SZS Type : Refutation
%            Derivation depth      :    6
%            Number of leaves      :   13
% Syntax   : Number of clauses     :   24 (  13 unt;   4 nHn;  24 RR)
%            Number of literals    :   46 (   2 equ;  22 neg)
%            Maximal clause size   :    5 (   1 avg)
%            Maximal term depth    :    2 (   1 avg)
%            Number of predicates  :    8 (   6 usr;   1 prp; 0-2 aty)
%            Number of functors    :    3 (   3 usr;   2 con; 0-1 aty)
%            Number of variables   :   22 (   2 sgn)

% Comments : 
%------------------------------------------------------------------------------
cnf(1,axiom,
    ( ~ in(A,B)
    | ~ in(B,A) ),
    file('NUM394+1.p',unknown),
    [] ).

cnf(8,axiom,
    ( ~ ordinal(A)
    | ~ ordinal(B)
    | ordinal_subset(A,B)
    | ordinal_subset(B,A) ),
    file('NUM394+1.p',unknown),
    [] ).

cnf(13,axiom,
    ( ~ ordinal(A)
    | ~ ordinal(B)
    | ~ ordinal_subset(A,B)
    | subset(A,B) ),
    file('NUM394+1.p',unknown),
    [] ).

cnf(15,axiom,
    ( ~ ordinal(A)
    | ~ ordinal(B)
    | ordinal_subset(A,A) ),
    file('NUM394+1.p',unknown),
    [] ).

cnf(16,plain,
    ( ~ ordinal(A)
    | ordinal_subset(A,A) ),
    inference(factor_simp,[status(thm)],[inference(copy,[status(thm)],[15])]),
    [iquote('copy,15,factor_simp')] ).

cnf(18,axiom,
    ( ~ ordinal(A)
    | ~ ordinal(B)
    | in(A,B)
    | A = B
    | in(B,A) ),
    file('NUM394+1.p',unknown),
    [] ).

cnf(19,axiom,
    ~ ordinal_subset(dollar_c13,dollar_c12),
    file('NUM394+1.p',unknown),
    [] ).

cnf(20,axiom,
    ~ in(dollar_c12,dollar_c13),
    file('NUM394+1.p',unknown),
    [] ).

cnf(21,axiom,
    ( ~ element(A,B)
    | empty(B)
    | in(A,B) ),
    file('NUM394+1.p',unknown),
    [] ).

cnf(23,axiom,
    ( element(A,powerset(B))
    | ~ subset(A,B) ),
    file('NUM394+1.p',unknown),
    [] ).

cnf(24,axiom,
    ( ~ in(A,B)
    | ~ element(B,powerset(C))
    | element(A,C) ),
    file('NUM394+1.p',unknown),
    [] ).

cnf(25,axiom,
    ( ~ in(A,B)
    | ~ element(B,powerset(C))
    | ~ empty(C) ),
    file('NUM394+1.p',unknown),
    [] ).

cnf(29,plain,
    ~ in(A,A),
    inference(factor,[status(thm)],[1]),
    [iquote('factor,1.1.2')] ).

cnf(63,axiom,
    ordinal(dollar_c13),
    file('NUM394+1.p',unknown),
    [] ).

cnf(64,axiom,
    ordinal(dollar_c12),
    file('NUM394+1.p',unknown),
    [] ).

cnf(120,plain,
    ordinal_subset(dollar_c13,dollar_c13),
    inference(hyper,[status(thm)],[63,16]),
    [iquote('hyper,63,16')] ).

cnf(125,plain,
    ( in(dollar_c13,dollar_c12)
    | dollar_c13 = dollar_c12 ),
    inference(unit_del,[status(thm)],[inference(hyper,[status(thm)],[64,18,63]),20]),
    [iquote('hyper,64,18,63,unit_del,20')] ).

cnf(128,plain,
    ordinal_subset(dollar_c12,dollar_c13),
    inference(unit_del,[status(thm)],[inference(hyper,[status(thm)],[64,8,63]),19]),
    [iquote('hyper,64,8,63,unit_del,19')] ).

cnf(160,plain,
    subset(dollar_c12,dollar_c13),
    inference(hyper,[status(thm)],[128,13,64,63]),
    [iquote('hyper,128,13,64,63')] ).

cnf(165,plain,
    element(dollar_c12,powerset(dollar_c13)),
    inference(hyper,[status(thm)],[160,23]),
    [iquote('hyper,160,23')] ).

cnf(435,plain,
    in(dollar_c13,dollar_c12),
    inference(unit_del,[status(thm)],[inference(para_from,[status(thm),theory(equality)],[125,120]),19]),
    [iquote('para_from,125.2.1,120.1.2,unit_del,19')] ).

cnf(438,plain,
    element(dollar_c13,dollar_c13),
    inference(hyper,[status(thm)],[435,24,165]),
    [iquote('hyper,435,24,165')] ).

cnf(447,plain,
    empty(dollar_c13),
    inference(unit_del,[status(thm)],[inference(hyper,[status(thm)],[438,21]),29]),
    [iquote('hyper,438,21,unit_del,29')] ).

cnf(472,plain,
    $false,
    inference(hyper,[status(thm)],[447,25,435,165]),
    [iquote('hyper,447,25,435,165')] ).

%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.11/0.11  % Problem  : NUM394+1 : TPTP v8.1.0. Released v3.2.0.
% 0.11/0.12  % Command  : otter-tptp-script %s
% 0.12/0.33  % Computer : n027.cluster.edu
% 0.12/0.33  % Model    : x86_64 x86_64
% 0.12/0.33  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.33  % Memory   : 8042.1875MB
% 0.12/0.33  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.12/0.33  % CPULimit : 300
% 0.12/0.33  % WCLimit  : 300
% 0.12/0.33  % DateTime : Wed Jul 27 10:11:06 EDT 2022
% 0.12/0.33  % CPUTime  : 
% 1.86/2.08  ----- Otter 3.3f, August 2004 -----
% 1.86/2.08  The process was started by sandbox2 on n027.cluster.edu,
% 1.86/2.08  Wed Jul 27 10:11:07 2022
% 1.86/2.08  The command was "./otter".  The process ID is 19526.
% 1.86/2.08  
% 1.86/2.08  set(prolog_style_variables).
% 1.86/2.08  set(auto).
% 1.86/2.08     dependent: set(auto1).
% 1.86/2.08     dependent: set(process_input).
% 1.86/2.08     dependent: clear(print_kept).
% 1.86/2.08     dependent: clear(print_new_demod).
% 1.86/2.08     dependent: clear(print_back_demod).
% 1.86/2.08     dependent: clear(print_back_sub).
% 1.86/2.08     dependent: set(control_memory).
% 1.86/2.08     dependent: assign(max_mem, 12000).
% 1.86/2.08     dependent: assign(pick_given_ratio, 4).
% 1.86/2.08     dependent: assign(stats_level, 1).
% 1.86/2.08     dependent: assign(max_seconds, 10800).
% 1.86/2.08  clear(print_given).
% 1.86/2.08  
% 1.86/2.08  formula_list(usable).
% 1.86/2.08  all A (A=A).
% 1.86/2.08  all A B (in(A,B)-> -in(B,A)).
% 1.86/2.08  all A (empty(A)->function(A)).
% 1.86/2.08  all A (ordinal(A)->epsilon_transitive(A)&epsilon_connected(A)).
% 1.86/2.08  all A (empty(A)->relation(A)).
% 1.86/2.08  all A (relation(A)&empty(A)&function(A)->relation(A)&function(A)&one_to_one(A)).
% 1.86/2.08  all A (epsilon_transitive(A)&epsilon_connected(A)->ordinal(A)).
% 1.86/2.08  all A B (ordinal(A)&ordinal(B)->ordinal_subset(A,B)|ordinal_subset(B,A)).
% 1.86/2.08  all A (epsilon_transitive(A)<-> (all B (in(B,A)->subset(B,A)))).
% 1.86/2.08  all A exists B element(B,A).
% 1.86/2.08  empty(empty_set).
% 1.86/2.08  relation(empty_set).
% 1.86/2.08  relation_empty_yielding(empty_set).
% 1.86/2.08  empty(empty_set).
% 1.86/2.08  empty(empty_set).
% 1.86/2.08  relation(empty_set).
% 1.86/2.08  exists A (relation(A)&function(A)).
% 1.86/2.08  exists A (epsilon_transitive(A)&epsilon_connected(A)&ordinal(A)).
% 1.86/2.08  exists A (empty(A)&relation(A)).
% 1.86/2.08  exists A empty(A).
% 1.86/2.08  exists A (relation(A)&empty(A)&function(A)).
% 1.86/2.08  exists A (-empty(A)&relation(A)).
% 1.86/2.08  exists A (-empty(A)).
% 1.86/2.08  exists A (relation(A)&function(A)&one_to_one(A)).
% 1.86/2.08  exists A (relation(A)&relation_empty_yielding(A)).
% 1.86/2.08  exists A (relation(A)&relation_empty_yielding(A)&function(A)).
% 1.86/2.08  exists A (relation(A)&relation_non_empty(A)&function(A)).
% 1.86/2.08  all A B (ordinal(A)&ordinal(B)-> (ordinal_subset(A,B)<->subset(A,B))).
% 1.86/2.08  all A B (ordinal(A)&ordinal(B)->ordinal_subset(A,A)).
% 1.86/2.08  all A B subset(A,A).
% 1.86/2.08  all A B (in(A,B)->element(A,B)).
% 1.86/2.08  all A (ordinal(A)-> (all B (ordinal(B)-> -(-in(A,B)&A!=B& -in(B,A))))).
% 1.86/2.08  -(all A (ordinal(A)-> (all B (ordinal(B)->ordinal_subset(A,B)|in(B,A))))).
% 1.86/2.08  all A B (element(A,B)->empty(B)|in(A,B)).
% 1.86/2.08  all A B (element(A,powerset(B))<->subset(A,B)).
% 1.86/2.08  all A B C (in(A,B)&element(B,powerset(C))->element(A,C)).
% 1.86/2.08  all A B C (-(in(A,B)&element(B,powerset(C))&empty(C))).
% 1.86/2.08  all A (empty(A)->A=empty_set).
% 1.86/2.08  all A B (-(in(A,B)&empty(B))).
% 1.86/2.08  all A B (-(empty(A)&A!=B&empty(B))).
% 1.86/2.08  end_of_list.
% 1.86/2.08  
% 1.86/2.08  -------> usable clausifies to:
% 1.86/2.08  
% 1.86/2.08  list(usable).
% 1.86/2.08  0 [] A=A.
% 1.86/2.08  0 [] -in(A,B)| -in(B,A).
% 1.86/2.08  0 [] -empty(A)|function(A).
% 1.86/2.08  0 [] -ordinal(A)|epsilon_transitive(A).
% 1.86/2.08  0 [] -ordinal(A)|epsilon_connected(A).
% 1.86/2.08  0 [] -empty(A)|relation(A).
% 1.86/2.08  0 [] -relation(A)| -empty(A)| -function(A)|one_to_one(A).
% 1.86/2.08  0 [] -epsilon_transitive(A)| -epsilon_connected(A)|ordinal(A).
% 1.86/2.08  0 [] -ordinal(A)| -ordinal(B)|ordinal_subset(A,B)|ordinal_subset(B,A).
% 1.86/2.08  0 [] -epsilon_transitive(A)| -in(B,A)|subset(B,A).
% 1.86/2.08  0 [] epsilon_transitive(A)|in($f1(A),A).
% 1.86/2.08  0 [] epsilon_transitive(A)| -subset($f1(A),A).
% 1.86/2.08  0 [] element($f2(A),A).
% 1.86/2.08  0 [] empty(empty_set).
% 1.86/2.08  0 [] relation(empty_set).
% 1.86/2.08  0 [] relation_empty_yielding(empty_set).
% 1.86/2.08  0 [] empty(empty_set).
% 1.86/2.08  0 [] empty(empty_set).
% 1.86/2.08  0 [] relation(empty_set).
% 1.86/2.08  0 [] relation($c1).
% 1.86/2.08  0 [] function($c1).
% 1.86/2.08  0 [] epsilon_transitive($c2).
% 1.86/2.08  0 [] epsilon_connected($c2).
% 1.86/2.08  0 [] ordinal($c2).
% 1.86/2.08  0 [] empty($c3).
% 1.86/2.08  0 [] relation($c3).
% 1.86/2.08  0 [] empty($c4).
% 1.86/2.08  0 [] relation($c5).
% 1.86/2.08  0 [] empty($c5).
% 1.86/2.08  0 [] function($c5).
% 1.86/2.08  0 [] -empty($c6).
% 1.86/2.08  0 [] relation($c6).
% 1.86/2.08  0 [] -empty($c7).
% 1.86/2.08  0 [] relation($c8).
% 1.86/2.08  0 [] function($c8).
% 1.86/2.08  0 [] one_to_one($c8).
% 1.86/2.08  0 [] relation($c9).
% 1.86/2.08  0 [] relation_empty_yielding($c9).
% 1.86/2.08  0 [] relation($c10).
% 1.86/2.08  0 [] relation_empty_yielding($c10).
% 1.86/2.08  0 [] function($c10).
% 1.86/2.08  0 [] relation($c11).
% 1.86/2.08  0 [] relation_non_empty($c11).
% 1.86/2.08  0 [] function($c11).
% 1.86/2.08  0 [] -ordinal(A)| -ordinal(B)| -ordinal_subset(A,B)|subset(A,B).
% 1.86/2.08  0 [] -ordinal(A)| -ordinal(B)|ordinal_subset(A,B)| -subset(A,B).
% 1.86/2.08  0 [] -ordinal(A)| -ordinal(B)|ordinal_subset(A,A).
% 1.86/2.08  0 [] subset(A,A).
% 1.86/2.08  0 [] -in(A,B)|element(A,B).
% 1.86/2.08  0 [] -ordinal(A)| -ordinal(B)|in(A,B)|A=B|in(B,A).
% 1.86/2.08  0 [] ordinal($c13).
% 1.86/2.08  0 [] ordinal($c12).
% 1.86/2.08  0 [] -ordinal_subset($c13,$c12).
% 1.86/2.08  0 [] -in($c12,$c13).
% 1.86/2.08  0 [] -element(A,B)|empty(B)|in(A,B).
% 1.86/2.08  0 [] -element(A,powerset(B))|subset(A,B).
% 1.86/2.08  0 [] element(A,powerset(B))| -subset(A,B).
% 1.86/2.08  0 [] -in(A,B)| -element(B,powerset(C))|element(A,C).
% 1.86/2.08  0 [] -in(A,B)| -element(B,powerset(C))| -empty(C).
% 1.86/2.08  0 [] -empty(A)|A=empty_set.
% 1.86/2.08  0 [] -in(A,B)| -empty(B).
% 1.86/2.08  0 [] -empty(A)|A=B| -empty(B).
% 1.86/2.08  end_of_list.
% 1.86/2.08  
% 1.86/2.08  SCAN INPUT: prop=0, horn=0, equality=1, symmetry=0, max_lits=5.
% 1.86/2.08  
% 1.86/2.08  This ia a non-Horn set with equality.  The strategy will be
% 1.86/2.08  Knuth-Bendix, ordered hyper_res, factoring, and unit
% 1.86/2.08  deletion, with positive clauses in sos and nonpositive
% 1.86/2.08  clauses in usable.
% 1.86/2.08  
% 1.86/2.08     dependent: set(knuth_bendix).
% 1.86/2.08     dependent: set(anl_eq).
% 1.86/2.08     dependent: set(para_from).
% 1.86/2.08     dependent: set(para_into).
% 1.86/2.08     dependent: clear(para_from_right).
% 1.86/2.08     dependent: clear(para_into_right).
% 1.86/2.08     dependent: set(para_from_vars).
% 1.86/2.08     dependent: set(eq_units_both_ways).
% 1.86/2.08     dependent: set(dynamic_demod_all).
% 1.86/2.08     dependent: set(dynamic_demod).
% 1.86/2.08     dependent: set(order_eq).
% 1.86/2.08     dependent: set(back_demod).
% 1.86/2.08     dependent: set(lrpo).
% 1.86/2.08     dependent: set(hyper_res).
% 1.86/2.08     dependent: set(unit_deletion).
% 1.86/2.08     dependent: set(factor).
% 1.86/2.08  
% 1.86/2.08  ------------> process usable:
% 1.86/2.08  ** KEPT (pick-wt=6): 1 [] -in(A,B)| -in(B,A).
% 1.86/2.08  ** KEPT (pick-wt=4): 2 [] -empty(A)|function(A).
% 1.86/2.08  ** KEPT (pick-wt=4): 3 [] -ordinal(A)|epsilon_transitive(A).
% 1.86/2.08  ** KEPT (pick-wt=4): 4 [] -ordinal(A)|epsilon_connected(A).
% 1.86/2.08  ** KEPT (pick-wt=4): 5 [] -empty(A)|relation(A).
% 1.86/2.08  ** KEPT (pick-wt=8): 6 [] -relation(A)| -empty(A)| -function(A)|one_to_one(A).
% 1.86/2.08  ** KEPT (pick-wt=6): 7 [] -epsilon_transitive(A)| -epsilon_connected(A)|ordinal(A).
% 1.86/2.08  ** KEPT (pick-wt=10): 8 [] -ordinal(A)| -ordinal(B)|ordinal_subset(A,B)|ordinal_subset(B,A).
% 1.86/2.08  ** KEPT (pick-wt=8): 9 [] -epsilon_transitive(A)| -in(B,A)|subset(B,A).
% 1.86/2.08  ** KEPT (pick-wt=6): 10 [] epsilon_transitive(A)| -subset($f1(A),A).
% 1.86/2.08  ** KEPT (pick-wt=2): 11 [] -empty($c6).
% 1.86/2.08  ** KEPT (pick-wt=2): 12 [] -empty($c7).
% 1.86/2.08  ** KEPT (pick-wt=10): 13 [] -ordinal(A)| -ordinal(B)| -ordinal_subset(A,B)|subset(A,B).
% 1.86/2.08  ** KEPT (pick-wt=10): 14 [] -ordinal(A)| -ordinal(B)|ordinal_subset(A,B)| -subset(A,B).
% 1.86/2.08  ** KEPT (pick-wt=5): 16 [copy,15,factor_simp] -ordinal(A)|ordinal_subset(A,A).
% 1.86/2.08  ** KEPT (pick-wt=6): 17 [] -in(A,B)|element(A,B).
% 1.86/2.08  ** KEPT (pick-wt=13): 18 [] -ordinal(A)| -ordinal(B)|in(A,B)|A=B|in(B,A).
% 1.86/2.08  ** KEPT (pick-wt=3): 19 [] -ordinal_subset($c13,$c12).
% 1.86/2.08  ** KEPT (pick-wt=3): 20 [] -in($c12,$c13).
% 1.86/2.08  ** KEPT (pick-wt=8): 21 [] -element(A,B)|empty(B)|in(A,B).
% 1.86/2.08  ** KEPT (pick-wt=7): 22 [] -element(A,powerset(B))|subset(A,B).
% 1.86/2.08  ** KEPT (pick-wt=7): 23 [] element(A,powerset(B))| -subset(A,B).
% 1.86/2.08  ** KEPT (pick-wt=10): 24 [] -in(A,B)| -element(B,powerset(C))|element(A,C).
% 1.86/2.08  ** KEPT (pick-wt=9): 25 [] -in(A,B)| -element(B,powerset(C))| -empty(C).
% 1.86/2.08  ** KEPT (pick-wt=5): 26 [] -empty(A)|A=empty_set.
% 1.86/2.08  ** KEPT (pick-wt=5): 27 [] -in(A,B)| -empty(B).
% 1.86/2.08  ** KEPT (pick-wt=7): 28 [] -empty(A)|A=B| -empty(B).
% 1.86/2.08  
% 1.86/2.08  ------------> process sos:
% 1.86/2.08  ** KEPT (pick-wt=3): 33 [] A=A.
% 1.86/2.08  ** KEPT (pick-wt=6): 34 [] epsilon_transitive(A)|in($f1(A),A).
% 1.86/2.08  ** KEPT (pick-wt=4): 35 [] element($f2(A),A).
% 1.86/2.08  ** KEPT (pick-wt=2): 36 [] empty(empty_set).
% 1.86/2.08  ** KEPT (pick-wt=2): 37 [] relation(empty_set).
% 1.86/2.08  ** KEPT (pick-wt=2): 38 [] relation_empty_yielding(empty_set).
% 1.86/2.08    Following clause subsumed by 36 during input processing: 0 [] empty(empty_set).
% 1.86/2.08    Following clause subsumed by 36 during input processing: 0 [] empty(empty_set).
% 1.86/2.08    Following clause subsumed by 37 during input processing: 0 [] relation(empty_set).
% 1.86/2.08  ** KEPT (pick-wt=2): 39 [] relation($c1).
% 1.86/2.08  ** KEPT (pick-wt=2): 40 [] function($c1).
% 1.86/2.08  ** KEPT (pick-wt=2): 41 [] epsilon_transitive($c2).
% 1.86/2.08  ** KEPT (pick-wt=2): 42 [] epsilon_connected($c2).
% 1.86/2.08  ** KEPT (pick-wt=2): 43 [] ordinal($c2).
% 1.86/2.08  ** KEPT (pick-wt=2): 44 [] empty($c3).
% 1.86/2.08  ** KEPT (pick-wt=2): 45 [] relation($c3).
% 1.86/2.08  ** KEPT (pick-wt=2): 46 [] empty($c4).
% 1.86/2.08  ** KEPT (pick-wt=2): 47 [] relation($c5).
% 1.86/2.08  ** KEPT (pick-wt=2): 48 [] empty($c5).
% 1.86/2.08  ** KEPT (pick-wt=2): 49 [] function($c5).
% 1.86/2.08  ** KEPT (pick-wt=2): 50 [] relation($c6).
% 1.86/2.08  ** KEPT (pick-wt=2): 51 [] relation($c8).
% 1.86/2.08  ** KEPT (pick-wt=2): 52 [] function($c8).
% 1.86/2.08  ** KEPT (pick-wt=2): 53 [] one_to_one($c8).
% 1.86/2.08  ** KEPT (pick-wt=2): 54 [] relation($c9).
% 1.86/2.08  ** KEPT (pick-wt=2): 55 [] relation_empty_yielding($c9).
% 1.92/2.11  ** KEPT (pick-wt=2): 56 [] relation($c10).
% 1.92/2.11  ** KEPT (pick-wt=2): 57 [] relation_empty_yielding($c10).
% 1.92/2.11  ** KEPT (pick-wt=2): 58 [] function($c10).
% 1.92/2.11  ** KEPT (pick-wt=2): 59 [] relation($c11).
% 1.92/2.11  ** KEPT (pick-wt=2): 60 [] relation_non_empty($c11).
% 1.92/2.11  ** KEPT (pick-wt=2): 61 [] function($c11).
% 1.92/2.11  ** KEPT (pick-wt=3): 62 [] subset(A,A).
% 1.92/2.11  ** KEPT (pick-wt=2): 63 [] ordinal($c13).
% 1.92/2.11  ** KEPT (pick-wt=2): 64 [] ordinal($c12).
% 1.92/2.11    Following clause subsumed by 33 during input processing: 0 [copy,33,flip.1] A=A.
% 1.92/2.11  33 back subsumes 32.
% 1.92/2.11  33 back subsumes 31.
% 1.92/2.11  62 back subsumes 30.
% 1.92/2.11  
% 1.92/2.11  ======= end of input processing =======
% 1.92/2.11  
% 1.92/2.11  =========== start of search ===========
% 1.92/2.11  
% 1.92/2.11  -------- PROOF -------- 
% 1.92/2.11  
% 1.92/2.11  -----> EMPTY CLAUSE at   0.03 sec ----> 472 [hyper,447,25,435,165] $F.
% 1.92/2.11  
% 1.92/2.11  Length of proof is 10.  Level of proof is 5.
% 1.92/2.11  
% 1.92/2.11  ---------------- PROOF ----------------
% 1.92/2.11  % SZS status Theorem
% 1.92/2.11  % SZS output start Refutation
% See solution above
% 1.92/2.11  ------------ end of proof -------------
% 1.92/2.11  
% 1.92/2.11  
% 1.92/2.11  Search stopped by max_proofs option.
% 1.92/2.11  
% 1.92/2.11  
% 1.92/2.11  Search stopped by max_proofs option.
% 1.92/2.11  
% 1.92/2.11  ============ end of search ============
% 1.92/2.11  
% 1.92/2.11  -------------- statistics -------------
% 1.92/2.11  clauses given                100
% 1.92/2.11  clauses generated           1167
% 1.92/2.11  clauses kept                 466
% 1.92/2.11  clauses forward subsumed     771
% 1.92/2.11  clauses back subsumed         48
% 1.92/2.11  Kbytes malloced             1953
% 1.92/2.11  
% 1.92/2.11  ----------- times (seconds) -----------
% 1.92/2.11  user CPU time          0.03          (0 hr, 0 min, 0 sec)
% 1.92/2.11  system CPU time        0.00          (0 hr, 0 min, 0 sec)
% 1.92/2.11  wall-clock time        1             (0 hr, 0 min, 1 sec)
% 1.92/2.11  
% 1.92/2.11  That finishes the proof of the theorem.
% 1.92/2.11  
% 1.92/2.11  Process 19526 finished Wed Jul 27 10:11:08 2022
% 1.92/2.11  Otter interrupted
% 1.92/2.11  PROOF FOUND
%------------------------------------------------------------------------------