TSTP Solution File: SYN049+1 by GKC---0.8
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- Process Solution
%------------------------------------------------------------------------------
% File : GKC---0.8
% Problem : SYN049+1 : TPTP v8.1.2. Released v2.0.0.
% Transfm : none
% Format : tptp:raw
% Command : gkc %s
% 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 : Fri Sep 1 02:59:34 EDT 2023
% Result : Theorem 0.18s 0.41s
% Output : CNFRefutation 0.18s
% Verified :
% SZS Type : -
% Comments :
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.03/0.12 % Problem : SYN049+1 : TPTP v8.1.2. Released v2.0.0.
% 0.03/0.12 % Command : gkc %s
% 0.12/0.33 % Computer : n009.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 : Sat Aug 26 21:14:05 EDT 2023
% 0.12/0.34 % CPUTime :
% 0.18/0.38
% 0.18/0.38 input clause set summed statistics:
% 0.18/0.38 ----------------------------------
% 0.18/0.38 in_clause_count: 3
% 0.18/0.38 in_rule_clause_count: 3
% 0.18/0.38 in_fact_clause_count: 0
% 0.18/0.38 in_answer_clause_count: 0
% 0.18/0.38 in_ground_clause_count: 1
% 0.18/0.38 in_unit_clause_count: 2
% 0.18/0.38 in_horn_clause_count: 3
% 0.18/0.38 in_pos_clause_count: 1
% 0.18/0.38 in_neg_clause_count: 1
% 0.18/0.38 in_poseq_clause_count: 0
% 0.18/0.38 in_negeq_clause_count: 0
% 0.18/0.38 in_unitposeq_clause_count: 0
% 0.18/0.38 in_chain_clause_count: 0
% 0.18/0.38 in_min_length: 1
% 0.18/0.38 in_max_length: 2
% 0.18/0.38 in_min_depth: 1
% 0.18/0.38 in_max_depth: 1
% 0.18/0.38 in_min_size: 2
% 0.18/0.38 in_max_size: 4
% 0.18/0.38 in_min_vars: 0
% 0.18/0.38 in_max_vars: 1
% 0.18/0.38 in_extaxiom_count: 0
% 0.18/0.38 in_axiom_count: 0
% 0.18/0.38 in_assumption_count: 0
% 0.18/0.38 in_goal_count: 3
% 0.18/0.38 in_neg_goal_count: 1
% 0.18/0.38 in_pos_goal_count: 1
% 0.18/0.38 in_posunit_goal_count: 1
% 0.18/0.38
% 0.18/0.38 auto guide:
% 0.18/0.38 -----------
% 0.18/0.38 {
% 0.18/0.38 "print":1,
% 0.18/0.38 "print_level": 15,
% 0.18/0.38 "max_size": 0,
% 0.18/0.38 "max_depth": 0,
% 0.18/0.38 "max_length": 0,
% 0.18/0.38 "max_dseconds": 0,
% 0.18/0.38 "equality":0,
% 0.18/0.38 "runs":[
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["hardness_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":1, "strategy":["unit"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref"], "weight_select_ratio":20},
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref"], "query_preference":0, "var_weight":70, "repeat_var_weight":70},
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref"], "weight_select_ratio":100, "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["hardness_pref"], "weight_select_ratio":100, "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":1, "strategy":["unit"], "weight_select_ratio":100, "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref"], "weight_select_ratio":100, "query_preference":0, "var_weight":70, "repeat_var_weight":70},
% 0.18/0.38 {"max_dseconds":1, "strategy":["unit"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":1, "strategy":["positive_pref"], "query_preference":0, "reverse_clauselist":1},
% 0.18/0.38 {"max_dseconds":1, "strategy":["query_focus", "unit"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["query_focus", "positive_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["hardness_pref"], "query_preference":0, "weight_select_ratio":20, "depth_penalty":50, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":1, "strategy":["hardness_pref", "max_ground_weight"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref", "max_ground_weight"], "query_preference":0},
% 0.18/0.38 {"length_penalty":100, "query_preference":0, "strategy":["negative_pref"], "max_dseconds":1},
% 0.18/0.38 {"strategy":["hardness_pref", "max_weight"], "length_penalty":100, "depth_penalty":50, "max_depth":3, "var_weight":10, "repeat_var_weight":10, "max_dseconds":1},
% 0.18/0.38 {"max_dseconds":1, "strategy":["positive_pref"], "query_preference":0},
% 0.18/0.38 {"var_weight":70, "repeat_var_weight":70, "max_depth":3, "query_preference":0, "strategy":["negative_pref"], "max_dseconds":1},
% 0.18/0.38 {"max_dseconds":1, "strategy":["query_focus"], "query_preference":3},
% 0.18/0.38 {"max_dseconds":1, "strategy":["unit"], "query_preference":0, "var_weight":1, "depth_penalty":100, "repeat_var_weight":1},
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref"], "max_depth":5, "query_preference":0},
% 0.18/0.38 {"max_dseconds":1, "strategy":["negative_pref"], "max_weight":40, "query_preference":0},
% 0.18/0.38
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["hardness_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":10, "strategy":["unit"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref"], "weight_select_ratio":20},
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref"], "query_preference":0, "var_weight":70, "repeat_var_weight":70},
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref"], "weight_select_ratio":100, "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["hardness_pref"], "weight_select_ratio":100, "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":10, "strategy":["unit"], "weight_select_ratio":100, "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref"], "weight_select_ratio":100, "query_preference":0, "var_weight":70, "repeat_var_weight":70},
% 0.18/0.38 {"max_dseconds":10, "strategy":["unit"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":10, "strategy":["positive_pref"], "query_preference":0, "reverse_clauselist":1},
% 0.18/0.38 {"max_dseconds":10, "strategy":["query_focus", "unit"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["query_focus", "positive_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["hardness_pref"], "query_preference":0, "weight_select_ratio":20, "depth_penalty":50, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":10, "strategy":["hardness_pref", "max_ground_weight"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref", "max_ground_weight"], "query_preference":0},
% 0.18/0.38 {"length_penalty":100, "query_preference":0, "strategy":["negative_pref"], "max_dseconds":10},
% 0.18/0.38 {"strategy":["hardness_pref", "max_weight"], "length_penalty":100, "depth_penalty":50, "max_depth":3, "var_weight":10, "repeat_var_weight":10, "max_dseconds":10},
% 0.18/0.38 {"max_dseconds":10, "strategy":["positive_pref"], "query_preference":0},
% 0.18/0.38 {"var_weight":70, "repeat_var_weight":70, "max_depth":3, "query_preference":0, "strategy":["negative_pref"], "max_dseconds":10},
% 0.18/0.38 {"max_dseconds":10, "strategy":["query_focus"], "query_preference":3},
% 0.18/0.38 {"max_dseconds":10, "strategy":["unit"], "query_preference":0, "var_weight":1, "depth_penalty":100, "repeat_var_weight":1},
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref"], "max_depth":5, "query_preference":0},
% 0.18/0.38 {"max_dseconds":10, "strategy":["negative_pref"], "max_weight":40, "query_preference":0},
% 0.18/0.38
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["hardness_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":50, "strategy":["unit"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref"], "weight_select_ratio":20},
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref"], "query_preference":0, "var_weight":70, "repeat_var_weight":70},
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref"], "weight_select_ratio":100, "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["hardness_pref"], "weight_select_ratio":100, "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":50, "strategy":["unit"], "weight_select_ratio":100, "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref"], "weight_select_ratio":100, "query_preference":0, "var_weight":70, "repeat_var_weight":70},
% 0.18/0.38 {"max_dseconds":50, "strategy":["unit"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":50, "strategy":["positive_pref"], "query_preference":0, "reverse_clauselist":1},
% 0.18/0.38 {"max_dseconds":50, "strategy":["query_focus", "unit"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["query_focus", "positive_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["hardness_pref"], "query_preference":0, "weight_select_ratio":20, "depth_penalty":50, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":50, "strategy":["hardness_pref", "max_ground_weight"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref", "max_ground_weight"], "query_preference":0},
% 0.18/0.38 {"length_penalty":100, "query_preference":0, "strategy":["negative_pref"], "max_dseconds":50},
% 0.18/0.38 {"strategy":["hardness_pref", "max_weight"], "length_penalty":100, "depth_penalty":50, "max_depth":3, "var_weight":10, "repeat_var_weight":10, "max_dseconds":50},
% 0.18/0.38 {"max_dseconds":50, "strategy":["positive_pref"], "query_preference":0},
% 0.18/0.38 {"var_weight":70, "repeat_var_weight":70, "max_depth":3, "query_preference":0, "strategy":["negative_pref"], "max_dseconds":50},
% 0.18/0.38 {"max_dseconds":50, "strategy":["query_focus"], "query_preference":3},
% 0.18/0.38 {"max_dseconds":50, "strategy":["unit"], "query_preference":0, "var_weight":1, "depth_penalty":100, "repeat_var_weight":1},
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref"], "max_depth":5, "query_preference":0},
% 0.18/0.38 {"max_dseconds":50, "strategy":["negative_pref"], "max_weight":40, "query_preference":0},
% 0.18/0.38
% 0.18/0.38 {"max_dseconds":250, "strategy":["negative_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":250, "strategy":["hardness_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":250, "strategy":["negative_pref"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":250, "strategy":["unit"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":250, "strategy":["negative_pref"], "weight_select_ratio":20},
% 0.18/0.38 {"max_dseconds":250, "strategy":["negative_pref"], "query_preference":0, "var_weight":70, "repeat_var_weight":70},
% 0.18/0.38 {"max_dseconds":250, "strategy":["positive_pref"], "query_preference":0, "reverse_clauselist":1},
% 0.18/0.38
% 0.18/0.38 {"max_dseconds":1250, "strategy":["negative_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":1250, "strategy":["hardness_pref"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":1250, "strategy":["negative_pref"], "query_preference":0, "weight_select_ratio":100, "depth_penalty":100, "length_penalty":100},
% 0.18/0.38 {"max_dseconds":1250, "strategy":["unit"], "query_preference":0},
% 0.18/0.38 {"max_dseconds":1250, "strategy":["negative_pref"], "weight_select_ratio":20},
% 0.18/0.38 {"max_dseconds":1250, "strategy":["negative_pref"], "query_preference":0, "var_weight":70, "repeat_var_weight":70},
% 0.18/0.38 {"max_dseconds":1250, "strategy":["positive_pref"], "query_preference":0, "reverse_clauselist":1}
% 0.18/0.38
% 0.18/0.38 ]}
% 0.18/0.38
% 0.18/0.38
% 0.18/0.38 **** run 1 fork 0 starts with strategy
% 0.18/0.38 {"max_dseconds":1,"strategy":["negative_pref"],"query_preference":0}
% 0.18/0.38
% 0.18/0.38 **** run 2 fork 1 starts with strategy
% 0.18/0.38 {"max_dseconds":1,"strategy":["hardness_pref"],"query_preference":0}
% 0.18/0.38
% 0.18/0.38 **** run 3 fork 2 starts with strategy
% 0.18/0.38 {"max_dseconds":1,"strategy":["negative_pref"],"query_preference":0,"weight_select_ratio":100,"depth_penalty":100,"length_penalty":100}
% 0.18/0.38
% 0.18/0.38 **** run 4 fork 3 starts with strategy
% 0.18/0.38 {"max_dseconds":1,"strategy":["unit"],"query_preference":0}
% 0.18/0.38
% 0.18/0.38 **** run 5 fork 4 starts with strategy
% 0.18/0.38 {"max_dseconds":1,"strategy":["negative_pref"],"weight_select_ratio":20}
% 0.18/0.38
% 0.18/0.38 **** run 6 fork 5 starts with strategy
% 0.18/0.38 {"max_dseconds":1,"strategy":["negative_pref"],"query_preference":0,"var_weight":70,"repeat_var_weight":70}
% 0.18/0.38
% 0.18/0.38 **** run 7 fork 6 starts with strategy
% 0.18/0.38 {"max_dseconds":1,"strategy":["negative_pref"],"weight_select_ratio":100,"query_preference":0}
% 0.18/0.38
% 0.18/0.38 **** run 8 fork 7 starts with strategy
% 0.18/0.38 {"max_dseconds":1,"strategy":["hardness_pref"],"weight_select_ratio":100,"query_preference":0}
% 0.18/0.41
% 0.18/0.41
% 0.18/0.41 result: proof found
% 0.18/0.41 for /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.18/0.41 by run 6 fork 5 strategy {"max_dseconds":1,"strategy":["negative_pref"],"query_preference":0,"var_weight":70,"repeat_var_weight":70}
% 0.18/0.41 % SZS status Theorem for /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.18/0.41
% 0.18/0.41 % SZS output start CNFRefutation for /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.18/0.41 fof('pel19_$sk', plain, ((~big_q(X1) & big_p(X1)) & (big_q($sk2) | ~big_p($sk1))),
% 0.18/0.41 inference(negpush_and_skolemize,[],['pel19'])).
% 0.18/0.41 fof('pel19', conjecture, (? [X] : (! [Y,Z] : ((big_p(Y) => big_q(Z)) => (big_p(X) => big_q(X))))),
% 0.18/0.41 input).
% 0.18/0.41 cnf('1', plain, (big_p(X)),
% 0.18/0.41 inference(cnf_transformation,[],['pel19_$sk'])).
% 0.18/0.41 cnf('2', plain, (~big_p($sk1) | big_q($sk2)),
% 0.18/0.41 inference(cnf_transformation,[],['pel19_$sk'])).
% 0.18/0.41 cnf('3', plain, (~big_q(X0)),
% 0.18/0.41 inference(cnf_transformation,[],['pel19_$sk'])).
% 0.18/0.41 cnf('4', plain, ($false),
% 0.18/0.41 inference(resolution,[then_simplify],['1','2','3'])).
% 0.18/0.41
% 0.18/0.41 % SZS output end CNFRefutation for /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.18/0.41
% 0.18/0.41 run 6 fork 5 statistics:
% 0.18/0.41 ----------------------------------
% 0.18/0.41 this run seconds: 0.003076
% 0.18/0.41 total seconds: 0.027846
% 0.18/0.41 stat_given_used: 3
% 0.18/0.41 stat_given_used_at_endgame: 0
% 0.18/0.41 stat_given_candidates: 3
% 0.18/0.41 stat_given_candidates_at_endgame: 0
% 0.18/0.41 stat_given_candidates_h: 0
% 0.18/0.41 stat_binres_derived_cl: 1
% 0.18/0.41 stat_binres_derived_cl_h: 0
% 0.18/0.41 stat_factor_derived_cl: 0
% 0.18/0.41 stat_para_derived_cl: 0
% 0.18/0.41 stat_tautologies_discarded: 0
% 0.18/0.41 stat_forward_subsumed: 0
% 0.18/0.41 stat_derived_cut: 1
% 0.18/0.41 stat_derived_rewritten: 0
% 0.18/0.41 stat_weight_discarded_building: 0
% 0.18/0.41 stat_weight_discarded_cl: 0
% 0.18/0.41 stat_internlimit_discarded_cl: 0
% 0.18/0.41 stat_simplified: 0 simplified 0 derived 0 given
% 0.18/0.41 stat_kept_cl: 0
% 0.18/0.41 stat_built_cl: 6
% 0.18/0.41 stat_hyperres_partial_cl: 0
% 0.18/0.41 stat_made_rewriters: 0
% 0.18/0.41 stat_backward_subsumed: 0
% 0.18/0.41 stat_propagated_subsumed: 0
% 0.18/0.41 stat_clsubs_attempted: 0
% 0.18/0.41 stat_clsubs_fact_groundunit_found: 0
% 0.18/0.41 stat_clsubs_rule_groundunit_found: 0
% 0.18/0.41 stat_clsubs_top_meta_attempted: 3
% 0.18/0.41 stat_clsubs_top_meta_failed: 3
% 0.18/0.41 stat_clsubs_top_meta_nonpref_attempted: 3
% 0.18/0.41 stat_clsubs_top_meta_nonpref_succeeded: 0
% 0.18/0.41 stat_clsubs_top_meta_pref_attempted: 0
% 0.18/0.41 stat_clsubs_top_meta_pref1_succeeded: 0
% 0.18/0.41 stat_clsubs_top_meta_pref2_succeeded: 0
% 0.18/0.41 stat_clsubs_top_meta_pref3_succeeded: 0
% 0.18/0.41 stat_clsubs_top_meta_pref_succeeded: 0
% 0.18/0.41 stat_clsubs_meta_attempted: 0
% 0.18/0.41 stat_clsubs_meta_failed: 0
% 0.18/0.41 stat_clsubs_predsymbs_attempted: 0
% 0.18/0.41 stat_clsubs_unit_attempted: 0
% 0.18/0.41 stat_clsubs_full_attempted: 0
% 0.18/0.41 stat_forwardsubs_attempted: 1
% 0.18/0.41 stat_lit_hash_added: 4
% 0.18/0.41 stat_lit_hash_computed: 13
% 0.18/0.41 stat_lit_hash_match_found: 0
% 0.18/0.41 stat_lit_hash_match_miss: 12
% 0.18/0.41 stat_lit_hash_cut_ok: 0
% 0.18/0.41 stat_lit_strong_cut_ok: 1
% 0.18/0.41 stat_lit_hash_subsume_ok: 0
% 0.18/0.41 clqueue els 10000000 used 1
% 0.18/0.41 clactive els 10000000 used 4
% 0.18/0.41 clactivesubsume els 10000000 used 19
% 0.18/0.41 queue_termbuf els 200000000 used 13
% 0.18/0.41 hyper_termbuf els 100000000 used 1
% 0.18/0.41 active_termbuf els 100000000 used 45
% 0.18/0.41 varstack els 5000 last used 1
% 0.18/0.41 given_termbuf els 10000000 last used 1
% 0.18/0.41 simplified_termbuf els 10000000 last used 1
% 0.18/0.41 derived_termbuf els 10000000 last used 21
% 0.18/0.41 wr_mallocs: 52
% 0.18/0.41 wr_callocs: 21
% 0.18/0.41 wr_reallocs: 0
% 0.18/0.41 wr_frees: 2
% 0.18/0.41 wr_malloc_bytes: 4162578932
% 0.18/0.41 wr_calloc_bytes: 112065536
% 0.18/0.41 wr_realloc_bytes: 0
% 0.18/0.41 wr_realloc_freebytes: 0
% 0.18/0.41 ----------------------------------
%------------------------------------------------------------------------------