TSTP Solution File: SET662+3 by Otter---3.3

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Otter---3.3
% Problem  : SET662+3 : TPTP v8.1.0. Released v2.2.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : otter-tptp-script %s

% Computer : n028.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 13:14:01 EDT 2022

% Result   : Theorem 1.79s 2.00s
% Output   : Refutation 1.79s
% Verified : 
% SZS Type : Refutation
%            Derivation depth      :    7
%            Number of leaves      :    9
% Syntax   : Number of clauses     :   16 (   8 unt;   4 nHn;   9 RR)
%            Number of literals    :   35 (   0 equ;  18 neg)
%            Maximal clause size   :    5 (   2 avg)
%            Maximal term depth    :    3 (   1 avg)
%            Number of predicates  :    4 (   3 usr;   1 prp; 0-2 aty)
%            Number of functors    :   10 (  10 usr;   4 con; 0-2 aty)
%            Number of variables   :   21 (   6 sgn)

% Comments : 
%------------------------------------------------------------------------------
cnf(2,axiom,
    ( ~ ilf_type(A,set_type)
    | ~ ilf_type(B,set_type)
    | ~ ilf_type(C,subset_type(cross_product(A,B)))
    | ilf_type(C,relation_type(A,B)) ),
    file('SET662+3.p',unknown),
    [] ).

cnf(8,axiom,
    ( ~ ilf_type(A,set_type)
    | ~ ilf_type(B,set_type)
    | ilf_type(B,subset_type(A))
    | ~ ilf_type(B,member_type(power_set(A))) ),
    file('SET662+3.p',unknown),
    [] ).

cnf(15,axiom,
    ( ~ ilf_type(A,set_type)
    | ~ empty(A)
    | ~ ilf_type(B,set_type)
    | ~ member(B,A) ),
    file('SET662+3.p',unknown),
    [] ).

cnf(20,axiom,
    ( ~ ilf_type(A,set_type)
    | ~ ilf_type(B,set_type)
    | member(A,power_set(B))
    | member(dollar_f5(A,B),A) ),
    file('SET662+3.p',unknown),
    [] ).

cnf(22,axiom,
    ( ~ ilf_type(A,set_type)
    | ~ empty(power_set(A)) ),
    file('SET662+3.p',unknown),
    [] ).

cnf(25,axiom,
    ( ~ ilf_type(A,set_type)
    | empty(B)
    | ~ ilf_type(B,set_type)
    | ilf_type(A,member_type(B))
    | ~ member(A,B) ),
    file('SET662+3.p',unknown),
    [] ).

cnf(37,axiom,
    ~ ilf_type(empty_set,relation_type(dollar_c2,dollar_c1)),
    file('SET662+3.p',unknown),
    [] ).

cnf(66,axiom,
    empty(empty_set),
    file('SET662+3.p',unknown),
    [] ).

cnf(68,axiom,
    ilf_type(A,set_type),
    file('SET662+3.p',unknown),
    [] ).

cnf(75,plain,
    ( member(A,power_set(B))
    | member(dollar_f5(A,B),A) ),
    inference(hyper,[status(thm)],[68,20,68]),
    [iquote('hyper,68,20,68')] ).

cnf(119,plain,
    member(empty_set,power_set(A)),
    inference(hyper,[status(thm)],[75,15,68,66,68]),
    [iquote('hyper,75,15,68,66,68')] ).

cnf(126,plain,
    ( empty(power_set(A))
    | ilf_type(empty_set,member_type(power_set(A))) ),
    inference(hyper,[status(thm)],[119,25,68,68]),
    [iquote('hyper,119,25,68,68')] ).

cnf(196,plain,
    ilf_type(empty_set,member_type(power_set(A))),
    inference(hyper,[status(thm)],[126,22,68]),
    [iquote('hyper,126,22,68')] ).

cnf(200,plain,
    ilf_type(empty_set,subset_type(A)),
    inference(hyper,[status(thm)],[196,8,68,68]),
    [iquote('hyper,196,8,68,68')] ).

cnf(202,plain,
    ilf_type(empty_set,relation_type(A,B)),
    inference(hyper,[status(thm)],[200,2,68,68]),
    [iquote('hyper,200,2,68,68')] ).

cnf(203,plain,
    $false,
    inference(binary,[status(thm)],[202,37]),
    [iquote('binary,202.1,37.1')] ).

%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.07/0.12  % Problem  : SET662+3 : TPTP v8.1.0. Released v2.2.0.
% 0.07/0.12  % Command  : otter-tptp-script %s
% 0.12/0.33  % Computer : n028.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 10:42:04 EDT 2022
% 0.12/0.33  % CPUTime  : 
% 1.79/1.99  ----- Otter 3.3f, August 2004 -----
% 1.79/1.99  The process was started by sandbox on n028.cluster.edu,
% 1.79/1.99  Wed Jul 27 10:42:04 2022
% 1.79/1.99  The command was "./otter".  The process ID is 23655.
% 1.79/1.99  
% 1.79/1.99  set(prolog_style_variables).
% 1.79/1.99  set(auto).
% 1.79/1.99     dependent: set(auto1).
% 1.79/1.99     dependent: set(process_input).
% 1.79/1.99     dependent: clear(print_kept).
% 1.79/1.99     dependent: clear(print_new_demod).
% 1.79/1.99     dependent: clear(print_back_demod).
% 1.79/1.99     dependent: clear(print_back_sub).
% 1.79/1.99     dependent: set(control_memory).
% 1.79/1.99     dependent: assign(max_mem, 12000).
% 1.79/1.99     dependent: assign(pick_given_ratio, 4).
% 1.79/1.99     dependent: assign(stats_level, 1).
% 1.79/1.99     dependent: assign(max_seconds, 10800).
% 1.79/1.99  clear(print_given).
% 1.79/1.99  
% 1.79/1.99  formula_list(usable).
% 1.79/1.99  all A (A=A).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)->subset(empty_set,cross_product(B,C))))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)-> (all D (ilf_type(D,subset_type(cross_product(B,C)))->ilf_type(D,relation_type(B,C))))& (all E (ilf_type(E,relation_type(B,C))->ilf_type(E,subset_type(cross_product(B,C)))))))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)-> (exists D ilf_type(D,relation_type(C,B)))))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> -member(B,empty_set)).
% 1.79/1.99  empty(empty_set).
% 1.79/1.99  type(empty_set,set_type).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)->ilf_type(cross_product(B,C),set_type)))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)-> (ilf_type(C,subset_type(B))<->ilf_type(C,member_type(power_set(B))))))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (exists C ilf_type(C,subset_type(B)))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)-> (subset(B,C)<-> (all D (ilf_type(D,set_type)-> (member(D,B)->member(D,C)))))))).
% 1.79/1.99  all B (ilf_type(B,set_type)->subset(B,B)).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (empty(B)<-> (all C (ilf_type(C,set_type)-> -member(C,B))))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)-> (member(B,power_set(C))<-> (all D (ilf_type(D,set_type)-> (member(D,B)->member(D,C)))))))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> -empty(power_set(B))&ilf_type(power_set(B),set_type)).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (-empty(C)&ilf_type(C,set_type)-> (ilf_type(B,member_type(C))<->member(B,C))))).
% 1.79/1.99  all B (-empty(B)&ilf_type(B,set_type)-> (exists C ilf_type(C,member_type(B)))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (relation_like(B)<-> (all C (ilf_type(C,set_type)-> (member(C,B)-> (exists D (ilf_type(D,set_type)& (exists E (ilf_type(E,set_type)&C=ordered_pair(D,E)))))))))).
% 1.79/1.99  all B (empty(B)&ilf_type(B,set_type)->relation_like(B)).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)-> (all D (ilf_type(D,subset_type(cross_product(B,C)))->relation_like(D)))))).
% 1.79/1.99  all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)->ilf_type(ordered_pair(B,C),set_type)))).
% 1.79/1.99  all B ilf_type(B,set_type).
% 1.79/1.99  -(all B (ilf_type(B,set_type)-> (all C (ilf_type(C,set_type)->ilf_type(empty_set,relation_type(B,C)))))).
% 1.79/1.99  end_of_list.
% 1.79/1.99  
% 1.79/1.99  -------> usable clausifies to:
% 1.79/1.99  
% 1.79/1.99  list(usable).
% 1.79/1.99  0 [] A=A.
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|subset(empty_set,cross_product(B,C)).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)| -ilf_type(D,subset_type(cross_product(B,C)))|ilf_type(D,relation_type(B,C)).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)| -ilf_type(E,relation_type(B,C))|ilf_type(E,subset_type(cross_product(B,C))).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|ilf_type($f1(B,C),relation_type(C,B)).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -member(B,empty_set).
% 1.79/1.99  0 [] empty(empty_set).
% 1.79/1.99  0 [] type(empty_set,set_type).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|ilf_type(cross_product(B,C),set_type).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)| -ilf_type(C,subset_type(B))|ilf_type(C,member_type(power_set(B))).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|ilf_type(C,subset_type(B))| -ilf_type(C,member_type(power_set(B))).
% 1.79/1.99  0 [] -ilf_type(B,set_type)|ilf_type($f2(B),subset_type(B)).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)| -subset(B,C)| -ilf_type(D,set_type)| -member(D,B)|member(D,C).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|subset(B,C)|ilf_type($f3(B,C),set_type).
% 1.79/1.99  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|subset(B,C)|member($f3(B,C),B).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|subset(B,C)| -member($f3(B,C),C).
% 1.79/2.00  0 [] -ilf_type(B,set_type)|subset(B,B).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -empty(B)| -ilf_type(C,set_type)| -member(C,B).
% 1.79/2.00  0 [] -ilf_type(B,set_type)|empty(B)|ilf_type($f4(B),set_type).
% 1.79/2.00  0 [] -ilf_type(B,set_type)|empty(B)|member($f4(B),B).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)| -member(B,power_set(C))| -ilf_type(D,set_type)| -member(D,B)|member(D,C).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|member(B,power_set(C))|ilf_type($f5(B,C),set_type).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|member(B,power_set(C))|member($f5(B,C),B).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|member(B,power_set(C))| -member($f5(B,C),C).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -empty(power_set(B)).
% 1.79/2.00  0 [] -ilf_type(B,set_type)|ilf_type(power_set(B),set_type).
% 1.79/2.00  0 [] -ilf_type(B,set_type)|empty(C)| -ilf_type(C,set_type)| -ilf_type(B,member_type(C))|member(B,C).
% 1.79/2.00  0 [] -ilf_type(B,set_type)|empty(C)| -ilf_type(C,set_type)|ilf_type(B,member_type(C))| -member(B,C).
% 1.79/2.00  0 [] empty(B)| -ilf_type(B,set_type)|ilf_type($f6(B),member_type(B)).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -relation_like(B)| -ilf_type(C,set_type)| -member(C,B)|ilf_type($f8(B,C),set_type).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -relation_like(B)| -ilf_type(C,set_type)| -member(C,B)|ilf_type($f7(B,C),set_type).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -relation_like(B)| -ilf_type(C,set_type)| -member(C,B)|C=ordered_pair($f8(B,C),$f7(B,C)).
% 1.79/2.00  0 [] -ilf_type(B,set_type)|relation_like(B)|ilf_type($f9(B),set_type).
% 1.79/2.00  0 [] -ilf_type(B,set_type)|relation_like(B)|member($f9(B),B).
% 1.79/2.00  0 [] -ilf_type(B,set_type)|relation_like(B)| -ilf_type(D,set_type)| -ilf_type(E,set_type)|$f9(B)!=ordered_pair(D,E).
% 1.79/2.00  0 [] -empty(B)| -ilf_type(B,set_type)|relation_like(B).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)| -ilf_type(D,subset_type(cross_product(B,C)))|relation_like(D).
% 1.79/2.00  0 [] -ilf_type(B,set_type)| -ilf_type(C,set_type)|ilf_type(ordered_pair(B,C),set_type).
% 1.79/2.00  0 [] ilf_type(B,set_type).
% 1.79/2.00  0 [] ilf_type($c2,set_type).
% 1.79/2.00  0 [] ilf_type($c1,set_type).
% 1.79/2.00  0 [] -ilf_type(empty_set,relation_type($c2,$c1)).
% 1.79/2.00  end_of_list.
% 1.79/2.00  
% 1.79/2.00  SCAN INPUT: prop=0, horn=0, equality=1, symmetry=0, max_lits=6.
% 1.79/2.00  
% 1.79/2.00  This ia a non-Horn set with equality.  The strategy will be
% 1.79/2.00  Knuth-Bendix, ordered hyper_res, factoring, and unit
% 1.79/2.00  deletion, with positive clauses in sos and nonpositive
% 1.79/2.00  clauses in usable.
% 1.79/2.00  
% 1.79/2.00     dependent: set(knuth_bendix).
% 1.79/2.00     dependent: set(anl_eq).
% 1.79/2.00     dependent: set(para_from).
% 1.79/2.00     dependent: set(para_into).
% 1.79/2.00     dependent: clear(para_from_right).
% 1.79/2.00     dependent: clear(para_into_right).
% 1.79/2.00     dependent: set(para_from_vars).
% 1.79/2.00     dependent: set(eq_units_both_ways).
% 1.79/2.00     dependent: set(dynamic_demod_all).
% 1.79/2.00     dependent: set(dynamic_demod).
% 1.79/2.00     dependent: set(order_eq).
% 1.79/2.00     dependent: set(back_demod).
% 1.79/2.00     dependent: set(lrpo).
% 1.79/2.00     dependent: set(hyper_res).
% 1.79/2.00     dependent: set(unit_deletion).
% 1.79/2.00     dependent: set(factor).
% 1.79/2.00  
% 1.79/2.00  ------------> process usable:
% 1.79/2.00  ** KEPT (pick-wt=11): 1 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|subset(empty_set,cross_product(A,B)).
% 1.79/2.00  ** KEPT (pick-wt=17): 2 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)| -ilf_type(C,subset_type(cross_product(A,B)))|ilf_type(C,relation_type(A,B)).
% 1.79/2.00  ** KEPT (pick-wt=17): 3 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)| -ilf_type(C,relation_type(A,B))|ilf_type(C,subset_type(cross_product(A,B))).
% 1.79/2.00  ** KEPT (pick-wt=13): 4 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|ilf_type($f1(A,B),relation_type(B,A)).
% 1.79/2.00  ** KEPT (pick-wt=6): 5 [] -ilf_type(A,set_type)| -member(A,empty_set).
% 1.79/2.00  ** KEPT (pick-wt=11): 6 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|ilf_type(cross_product(A,B),set_type).
% 1.79/2.00  ** KEPT (pick-wt=15): 7 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)| -ilf_type(B,subset_type(A))|ilf_type(B,member_type(power_set(A))).
% 1.79/2.00  ** KEPT (pick-wt=15): 8 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|ilf_type(B,subset_type(A))| -ilf_type(B,member_type(power_set(A))).
% 1.79/2.00  ** KEPT (pick-wt=8): 9 [] -ilf_type(A,set_type)|ilf_type($f2(A),subset_type(A)).
% 1.79/2.00  ** KEPT (pick-wt=18): 10 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)| -subset(A,B)| -ilf_type(C,set_type)| -member(C,A)|member(C,B).
% 1.79/2.00  ** KEPT (pick-wt=14): 11 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|subset(A,B)|ilf_type($f3(A,B),set_type).
% 1.79/2.00  ** KEPT (pick-wt=14): 12 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|subset(A,B)|member($f3(A,B),A).
% 1.79/2.00  ** KEPT (pick-wt=14): 13 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|subset(A,B)| -member($f3(A,B),B).
% 1.79/2.00  ** KEPT (pick-wt=6): 14 [] -ilf_type(A,set_type)|subset(A,A).
% 1.79/2.00  ** KEPT (pick-wt=11): 15 [] -ilf_type(A,set_type)| -empty(A)| -ilf_type(B,set_type)| -member(B,A).
% 1.79/2.00  ** KEPT (pick-wt=9): 16 [] -ilf_type(A,set_type)|empty(A)|ilf_type($f4(A),set_type).
% 1.79/2.00  ** KEPT (pick-wt=9): 17 [] -ilf_type(A,set_type)|empty(A)|member($f4(A),A).
% 1.79/2.00  ** KEPT (pick-wt=19): 18 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)| -member(A,power_set(B))| -ilf_type(C,set_type)| -member(C,A)|member(C,B).
% 1.79/2.00  ** KEPT (pick-wt=15): 19 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|member(A,power_set(B))|ilf_type($f5(A,B),set_type).
% 1.79/2.00  ** KEPT (pick-wt=15): 20 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|member(A,power_set(B))|member($f5(A,B),A).
% 1.79/2.00  ** KEPT (pick-wt=15): 21 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|member(A,power_set(B))| -member($f5(A,B),B).
% 1.79/2.00  ** KEPT (pick-wt=6): 22 [] -ilf_type(A,set_type)| -empty(power_set(A)).
% 1.79/2.00  ** KEPT (pick-wt=7): 23 [] -ilf_type(A,set_type)|ilf_type(power_set(A),set_type).
% 1.79/2.00  ** KEPT (pick-wt=15): 24 [] -ilf_type(A,set_type)|empty(B)| -ilf_type(B,set_type)| -ilf_type(A,member_type(B))|member(A,B).
% 1.79/2.00  ** KEPT (pick-wt=15): 25 [] -ilf_type(A,set_type)|empty(B)| -ilf_type(B,set_type)|ilf_type(A,member_type(B))| -member(A,B).
% 1.79/2.00  ** KEPT (pick-wt=10): 26 [] empty(A)| -ilf_type(A,set_type)|ilf_type($f6(A),member_type(A)).
% 1.79/2.00  ** KEPT (pick-wt=16): 27 [] -ilf_type(A,set_type)| -relation_like(A)| -ilf_type(B,set_type)| -member(B,A)|ilf_type($f8(A,B),set_type).
% 1.79/2.00  ** KEPT (pick-wt=16): 28 [] -ilf_type(A,set_type)| -relation_like(A)| -ilf_type(B,set_type)| -member(B,A)|ilf_type($f7(A,B),set_type).
% 1.79/2.00  ** KEPT (pick-wt=20): 30 [copy,29,flip.5] -ilf_type(A,set_type)| -relation_like(A)| -ilf_type(B,set_type)| -member(B,A)|ordered_pair($f8(A,B),$f7(A,B))=B.
% 1.79/2.00  ** KEPT (pick-wt=9): 31 [] -ilf_type(A,set_type)|relation_like(A)|ilf_type($f9(A),set_type).
% 1.79/2.00  ** KEPT (pick-wt=9): 32 [] -ilf_type(A,set_type)|relation_like(A)|member($f9(A),A).
% 1.79/2.00  ** KEPT (pick-wt=17): 33 [] -ilf_type(A,set_type)|relation_like(A)| -ilf_type(B,set_type)| -ilf_type(C,set_type)|$f9(A)!=ordered_pair(B,C).
% 1.79/2.00  ** KEPT (pick-wt=7): 34 [] -empty(A)| -ilf_type(A,set_type)|relation_like(A).
% 1.79/2.00  ** KEPT (pick-wt=14): 35 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)| -ilf_type(C,subset_type(cross_product(A,B)))|relation_like(C).
% 1.79/2.00  ** KEPT (pick-wt=11): 36 [] -ilf_type(A,set_type)| -ilf_type(B,set_type)|ilf_type(ordered_pair(A,B),set_type).
% 1.79/2.00  ** KEPT (pick-wt=5): 37 [] -ilf_type(empty_set,relation_type($c2,$c1)).
% 1.79/2.00  
% 1.79/2.00  ------------> process sos:
% 1.79/2.00  ** KEPT (pick-wt=3): 65 [] A=A.
% 1.79/2.00  ** KEPT (pick-wt=2): 66 [] empty(empty_set).
% 1.79/2.00  ** KEPT (pick-wt=3): 67 [] type(empty_set,set_type).
% 1.79/2.00  ** KEPT (pick-wt=3): 68 [] ilf_type(A,set_type).
% 1.79/2.00    Following clause subsumed by 68 during input processing: 0 [] ilf_type($c2,set_type).
% 1.79/2.00    Following clause subsumed by 68 during input processing: 0 [] ilf_type($c1,set_type).
% 1.79/2.00    Following clause subsumed by 65 during input processing: 0 [copy,65,flip.1] A=A.
% 1.79/2.00  68 back subsumes 63.
% 1.79/2.00  68 back subsumes 57.
% 1.79/2.00  68 back subsumes 56.
% 1.79/2.00  68 back subsumes 51.
% 1.79/2.00  68 back subsumes 42.
% 1.79/2.00  68 back subsumes 36.
% 1.79/2.00  68 back subsumes 31.
% 1.79/2.00  68 back subsumes 28.
% 1.79/2.00  68 back subsumes 27.
% 1.79/2.00  68 back subsumes 23.
% 1.79/2.00  68 back subsumes 19.
% 1.79/2.00  68 back subsumes 16.
% 1.79/2.00  68 back subsumes 11.
% 1.79/2.00  68 back subsumes 6.
% 1.79/2.00  
% 1.79/2.00  ======= end of input processing =======
% 1.79/2.00  
% 1.79/2.00  =========== start of search ===========
% 1.79/2.00  
% 1.79/2.00  -------- PROOF -------- 
% 1.79/2.00  
% 1.79/2.00  ----> UNIT CONFLICT at   0.01 sec ----> 203 [binary,202.1,37.1] $F.
% 1.79/2.00  
% 1.79/2.00  Length of proof is 6.  Level of proof is 6.
% 1.79/2.00  
% 1.79/2.00  ---------------- PROOF ----------------
% 1.79/2.00  % SZS status Theorem
% 1.79/2.00  % SZS output start Refutation
% See solution above
% 1.79/2.00  ------------ end of proof -------------
% 1.79/2.00  
% 1.79/2.00  
% 1.79/2.00  Search stopped by max_proofs option.
% 1.79/2.00  
% 1.79/2.00  
% 1.79/2.00  Search stopped by max_proofs option.
% 1.79/2.00  
% 1.79/2.00  ============ end of search ============
% 1.79/2.00  
% 1.79/2.00  -------------- statistics -------------
% 1.79/2.00  clauses given                 38
% 1.79/2.00  clauses generated            354
% 1.79/2.00  clauses kept                 201
% 1.79/2.00  clauses forward subsumed     190
% 1.79/2.00  clauses back subsumed         77
% 1.79/2.00  Kbytes malloced             1953
% 1.79/2.00  
% 1.79/2.00  ----------- times (seconds) -----------
% 1.79/2.00  user CPU time          0.01          (0 hr, 0 min, 0 sec)
% 1.79/2.00  system CPU time        0.00          (0 hr, 0 min, 0 sec)
% 1.79/2.00  wall-clock time        1             (0 hr, 0 min, 1 sec)
% 1.79/2.00  
% 1.79/2.00  That finishes the proof of the theorem.
% 1.79/2.00  
% 1.79/2.00  Process 23655 finished Wed Jul 27 10:42:05 2022
% 1.79/2.00  Otter interrupted
% 1.79/2.00  PROOF FOUND
%------------------------------------------------------------------------------