%------------------------------------------------------------------------------
% File     : cvc5---1.0.5
% Problem  : SYN706-1 : TPTP v8.1.2. Released v2.5.0.
% Transfm  : none
% Format   : tptp
% Command  : do_cvc5 %s %d

% Computer : n021.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 02:04:41 EDT 2023

% Result   : Unsatisfiable 0.22s 0.59s
% Output   : Proof 0.22s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.14  % Problem    : SYN706-1 : TPTP v8.1.2. Released v2.5.0.
% 0.00/0.15  % Command    : do_cvc5 %s %d
% 0.14/0.36  % Computer : n021.cluster.edu
% 0.14/0.36  % Model    : x86_64 x86_64
% 0.14/0.36  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.14/0.36  % Memory   : 8042.1875MB
% 0.14/0.36  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.14/0.36  % CPULimit   : 300
% 0.14/0.36  % WCLimit    : 300
% 0.14/0.36  % DateTime   : Sat Aug 26 21:05:27 EDT 2023
% 0.14/0.36  % CPUTime    : 
% 0.22/0.49  %----Proving TF0_NAR, FOF, or CNF
% 0.22/0.50  ------- convert to smt2 : /export/starexec/sandbox/tmp/tmp.qAfRlaOa9F/cvc5---1.0.5_11654.p...
% 0.22/0.51  ------- get file name : TPTP file name is SYN706-1
% 0.22/0.52  ------- cvc5-fof : /export/starexec/sandbox/solver/bin/cvc5---1.0.5_11654.smt2...
% 0.22/0.52  --- Run --decision=internal --simplification=none --no-inst-no-entail --no-cbqi --full-saturate-quant at 10...
% 0.22/0.59  % SZS status Unsatisfiable for SYN706-1
% 0.22/0.59  % SZS output start Proof for SYN706-1
% 0.22/0.60  (
% 0.22/0.60  (let ((_let_1 (forall ((X150 $$unsorted) (X151 $$unsorted)) (or (tptp.p48 (tptp.f38 (tptp.f40 tptp.c59 tptp.c50) (tptp.f8 (tptp.f11 tptp.c54 (tptp.f14 (tptp.f17 tptp.c55 tptp.c61) X150)) X151)) tptp.c60) (not (tptp.p45 (tptp.f20 tptp.c52 tptp.c50) X151)) (not (tptp.p46 (tptp.f23 tptp.c53 X150) (tptp.f5 tptp.c49 tptp.c50))))))) (let ((_let_2 (forall ((X137 $$unsorted) (X142 $$unsorted) (X136 $$unsorted)) (or (tptp.p46 (tptp.f23 tptp.c53 (tptp.f35 X137 X142)) (tptp.f5 tptp.c49 X136)) (not (tptp.p45 (tptp.f20 tptp.c52 X136) X137)))))) (let ((_let_3 (forall ((X98 $$unsorted) (X99 $$unsorted) (X100 $$unsorted) (X101 $$unsorted)) (or (tptp.p37 (tptp.f38 X98 X99) (tptp.f38 X100 X101)) (not (tptp.p36 X98 X100)) (not (tptp.p7 X99 X101)))))) (let ((_let_4 (forall ((X166 $$unsorted) (X167 $$unsorted)) (tptp.p7 (tptp.f8 (tptp.f11 tptp.c54 (tptp.f14 (tptp.f17 tptp.c55 X166) (tptp.f35 X167 X166))) X167) X167)))) (let ((_let_5 (forall ((X146 $$unsorted) (X147 $$unsorted) (X149 $$unsorted) (X148 $$unsorted)) (or (tptp.p48 X146 X147) (not (tptp.p47 X149 X147)) (not (tptp.p48 X148 X149)) (not (tptp.p37 X148 X146)))))) (let ((_let_6 (tptp.f40 tptp.c59 tptp.c50))) (let ((_let_7 (tptp.f38 _let_6 tptp.c58))) (let ((_let_8 (tptp.p48 _let_7 tptp.c60))) (let ((_let_9 (not _let_8))) (let ((_let_10 (tptp.f5 tptp.c49 tptp.c50))) (let ((_let_11 (tptp.p45 (tptp.f20 tptp.c52 tptp.c50) tptp.c58))) (let ((_let_12 (forall ((X88 $$unsorted)) (tptp.p36 X88 X88)))) (let ((_let_13 (forall ((X143 $$unsorted)) (tptp.p47 X143 X143)))) (let ((_let_14 (tptp.p36 _let_6 _let_6))) (let ((_let_15 (tptp.f35 tptp.c58 tptp.c61))) (let ((_let_16 (tptp.f17 tptp.c55 tptp.c61))) (let ((_let_17 (tptp.f8 (tptp.f11 tptp.c54 (tptp.f14 _let_16 _let_15)) tptp.c58))) (let ((_let_18 (tptp.p7 _let_17 tptp.c58))) (let ((_let_19 (not _let_18))) (let ((_let_20 (not _let_14))) (let ((_let_21 (tptp.f38 _let_6 _let_17))) (let ((_let_22 (tptp.p37 _let_21 _let_7))) (let ((_let_23 (or _let_22 _let_20 _let_19))) (let ((_let_24 (_let_12))) (let ((_let_25 (ASSUME :args _let_24))) (let ((_let_26 (_let_4))) (let ((_let_27 (ASSUME :args _let_26))) (let ((_let_28 (_let_3))) (let ((_let_29 (ASSUME :args _let_28))) (let ((_let_30 (not _let_22))) (let ((_let_31 (tptp.p48 _let_21 tptp.c60))) (let ((_let_32 (not _let_31))) (let ((_let_33 (tptp.p47 tptp.c60 tptp.c60))) (let ((_let_34 (not _let_33))) (let ((_let_35 (or _let_8 _let_34 _let_32 _let_30))) (let ((_let_36 (_let_5))) (let ((_let_37 (ASSUME :args _let_36))) (let ((_let_38 (tptp.p46 (tptp.f23 tptp.c53 _let_15) _let_10))) (let ((_let_39 (not _let_38))) (let ((_let_40 (not _let_11))) (let ((_let_41 (or _let_31 _let_40 _let_39))) (let ((_let_42 (_let_1))) (let ((_let_43 (ASSUME :args _let_42))) (let ((_let_44 (or _let_38 _let_40))) (let ((_let_45 (_let_2))) (let ((_let_46 (ASSUME :args _let_45))) (let ((_let_47 (ASSUME :args (_let_11)))) (let ((_let_48 (_let_13))) (let ((_let_49 (ASSUME :args _let_48))) (SCOPE (SCOPE (MACRO_RESOLUTION_TRUST (REORDERING (CNF_OR_POS :args (_let_23)) :args ((or _let_20 _let_19 _let_22 (not _let_23)))) (MACRO_RESOLUTION_TRUST (REORDERING (CNF_OR_POS :args (_let_35)) :args ((or _let_8 _let_34 _let_32 _let_30 (not _let_35)))) (ASSUME :args (_let_9)) (MACRO_RESOLUTION_TRUST (IMPLIES_ELIM (SCOPE (INSTANTIATE _let_49 :args (tptp.c60 QUANTIFIERS_INST_ENUM)) :args _let_48)) _let_49 :args (_let_33 false _let_13)) (MACRO_RESOLUTION_TRUST (REORDERING (CNF_OR_POS :args (_let_41)) :args ((or _let_40 _let_39 _let_31 (not _let_41)))) _let_47 (MACRO_RESOLUTION_TRUST (REORDERING (CNF_OR_POS :args (_let_44)) :args ((or _let_40 _let_38 (not _let_44)))) _let_47 (MACRO_RESOLUTION_TRUST (IMPLIES_ELIM (SCOPE (INSTANTIATE _let_46 :args (tptp.c58 tptp.c61 tptp.c50 QUANTIFIERS_INST_ENUM)) :args _let_45)) _let_46 :args (_let_44 false _let_2)) :args (_let_38 false _let_11 false _let_44)) (MACRO_RESOLUTION_TRUST (IMPLIES_ELIM (SCOPE (INSTANTIATE _let_43 :args (_let_15 tptp.c58 QUANTIFIERS_INST_E_MATCHING ((tptp.f8 (tptp.f11 tptp.c54 (tptp.f14 _let_16 X150)) X151)))) :args _let_42)) _let_43 :args (_let_41 false _let_1)) :args (_let_31 false _let_11 false _let_38 false _let_41)) (MACRO_RESOLUTION_TRUST (IMPLIES_ELIM (SCOPE (INSTANTIATE _let_37 :args (_let_7 tptp.c60 tptp.c60 _let_21 QUANTIFIERS_INST_E_MATCHING ((not (= (tptp.p48 X146 X147) true)) (not (= (tptp.p48 X148 X149) false))))) :args _let_36)) _let_37 :args (_let_35 false _let_5)) :args (_let_30 true _let_8 false _let_33 false _let_31 false _let_35)) (MACRO_RESOLUTION_TRUST (IMPLIES_ELIM (SCOPE (INSTANTIATE _let_29 :args (_let_6 _let_17 _let_6 tptp.c58 QUANTIFIERS_INST_E_MATCHING ((not (= (tptp.p36 X98 X100) false)) (not (= (tptp.p7 X99 X101) false))))) :args _let_28)) _let_29 :args (_let_23 false _let_3)) (MACRO_RESOLUTION_TRUST (IMPLIES_ELIM (SCOPE (INSTANTIATE _let_27 :args (tptp.c61 tptp.c58 QUANTIFIERS_INST_ENUM)) :args _let_26)) _let_27 :args (_let_18 false _let_4)) (MACRO_RESOLUTION_TRUST (IMPLIES_ELIM (SCOPE (INSTANTIATE _let_25 :args (_let_6 QUANTIFIERS_INST_ENUM)) :args _let_24)) _let_25 :args (_let_14 false _let_12)) :args (false true _let_22 false _let_23 false _let_18 false _let_14)) :args ((forall ((X0 $$unsorted)) (tptp.p10 X0 X0)) (forall ((X168 $$unsorted)) (tptp.p9 X168 X168)) (forall ((X159 $$unsorted)) (tptp.p7 X159 X159)) (forall ((X152 $$unsorted)) (tptp.p6 X152 X152)) _let_13 (forall ((X125 $$unsorted)) (tptp.p43 X125 X125)) (forall ((X118 $$unsorted)) (tptp.p41 X118 X118)) (forall ((X105 $$unsorted)) (tptp.p4 X105 X105)) (forall ((X102 $$unsorted)) (tptp.p39 X102 X102)) (forall ((X95 $$unsorted)) (tptp.p37 X95 X95)) _let_12 (forall ((X85 $$unsorted)) (tptp.p33 X85 X85)) (forall ((X78 $$unsorted)) (tptp.p3 X78 X78)) (forall ((X71 $$unsorted)) (tptp.p29 X71 X71)) (forall ((X64 $$unsorted)) (tptp.p27 X64 X64)) (forall ((X61 $$unsorted)) (tptp.p26 X61 X61)) (forall ((X54 $$unsorted)) (tptp.p24 X54 X54)) (forall ((X47 $$unsorted)) (tptp.p22 X47 X47)) (forall ((X44 $$unsorted)) (tptp.p21 X44 X44)) (forall ((X41 $$unsorted)) (tptp.p2 X41 X41)) (forall ((X34 $$unsorted)) (tptp.p19 X34 X34)) (forall ((X31 $$unsorted)) (tptp.p18 X31 X31)) (forall ((X24 $$unsorted)) (tptp.p16 X24 X24)) (forall ((X21 $$unsorted)) (tptp.p15 X21 X21)) (forall ((X14 $$unsorted)) (tptp.p13 X14 X14)) (forall ((X7 $$unsorted)) (tptp.p12 X7 X7)) _let_11 (not (tptp.p4 _let_10 tptp.c51)) _let_9 (forall ((X1 $$unsorted) (X2 $$unsorted) (X0 $$unsorted)) (or (tptp.p10 X1 X2) (not (tptp.p10 X0 X1)) (not (tptp.p10 X0 X2)))) (forall ((X169 $$unsorted) (X170 $$unsorted) (X168 $$unsorted)) (or (tptp.p9 X169 X170) (not (tptp.p9 X168 X170)) (not (tptp.p9 X168 X169)))) (forall ((X160 $$unsorted) (X161 $$unsorted) (X159 $$unsorted)) (or (tptp.p7 X160 X161) (not (tptp.p7 X159 X160)) (not (tptp.p7 X159 X161)))) (forall ((X153 $$unsorted) (X154 $$unsorted) (X152 $$unsorted)) (or (tptp.p6 X153 X154) (not (tptp.p6 X152 X153)) (not (tptp.p6 X152 X154)))) (forall ((X144 $$unsorted) (X145 $$unsorted) (X143 $$unsorted)) (or (tptp.p47 X144 X145) (not (tptp.p47 X143 X144)) (not (tptp.p47 X143 X145)))) (forall ((X126 $$unsorted) (X127 $$unsorted) (X125 $$unsorted)) (or (tptp.p43 X126 X127) (not (tptp.p43 X125 X126)) (not (tptp.p43 X125 X127)))) (forall ((X119 $$unsorted) (X120 $$unsorted) (X118 $$unsorted)) (or (tptp.p41 X119 X120) (not (tptp.p41 X118 X119)) (not (tptp.p41 X118 X120)))) (forall ((X106 $$unsorted) (X107 $$unsorted) (X105 $$unsorted)) (or (tptp.p4 X106 X107) (not (tptp.p4 X105 X106)) (not (tptp.p4 X105 X107)))) (forall ((X103 $$unsorted) (X104 $$unsorted) (X102 $$unsorted)) (or (tptp.p39 X103 X104) (not (tptp.p39 X102 X103)) (not (tptp.p39 X102 X104)))) (forall ((X96 $$unsorted) (X97 $$unsorted) (X95 $$unsorted)) (or (tptp.p37 X96 X97) (not (tptp.p37 X95 X96)) (not (tptp.p37 X95 X97)))) (forall ((X89 $$unsorted) (X90 $$unsorted) (X88 $$unsorted)) (or (tptp.p36 X89 X90) (not (tptp.p36 X88 X89)) (not (tptp.p36 X88 X90)))) (forall ((X86 $$unsorted) (X87 $$unsorted) (X85 $$unsorted)) (or (tptp.p33 X86 X87) (not (tptp.p33 X85 X86)) (not (tptp.p33 X85 X87)))) (forall ((X79 $$unsorted) (X80 $$unsorted) (X78 $$unsorted)) (or (tptp.p3 X79 X80) (not (tptp.p3 X78 X79)) (not (tptp.p3 X78 X80)))) (forall ((X72 $$unsorted) (X73 $$unsorted) (X71 $$unsorted)) (or (tptp.p29 X72 X73) (not (tptp.p29 X71 X72)) (not (tptp.p29 X71 X73)))) (forall ((X65 $$unsorted) (X66 $$unsorted) (X64 $$unsorted)) (or (tptp.p27 X65 X66) (not (tptp.p27 X64 X65)) (not (tptp.p27 X64 X66)))) (forall ((X62 $$unsorted) (X63 $$unsorted) (X61 $$unsorted)) (or (tptp.p26 X62 X63) (not (tptp.p26 X61 X62)) (not (tptp.p26 X61 X63)))) (forall ((X55 $$unsorted) (X56 $$unsorted) (X54 $$unsorted)) (or (tptp.p24 X55 X56) (not (tptp.p24 X54 X55)) (not (tptp.p24 X54 X56)))) (forall ((X48 $$unsorted) (X49 $$unsorted) (X47 $$unsorted)) (or (tptp.p22 X48 X49) (not (tptp.p22 X47 X48)) (not (tptp.p22 X47 X49)))) (forall ((X45 $$unsorted) (X46 $$unsorted) (X44 $$unsorted)) (or (tptp.p21 X45 X46) (not (tptp.p21 X44 X45)) (not (tptp.p21 X44 X46)))) (forall ((X42 $$unsorted) (X43 $$unsorted) (X41 $$unsorted)) (or (tptp.p2 X42 X43) (not (tptp.p2 X41 X42)) (not (tptp.p2 X41 X43)))) (forall ((X35 $$unsorted) (X36 $$unsorted) (X34 $$unsorted)) (or (tptp.p19 X35 X36) (not (tptp.p19 X34 X35)) (not (tptp.p19 X34 X36)))) (forall ((X32 $$unsorted) (X33 $$unsorted) (X31 $$unsorted)) (or (tptp.p18 X32 X33) (not (tptp.p18 X31 X32)) (not (tptp.p18 X31 X33)))) (forall ((X25 $$unsorted) (X26 $$unsorted) (X24 $$unsorted)) (or (tptp.p16 X25 X26) (not (tptp.p16 X24 X25)) (not (tptp.p16 X24 X26)))) (forall ((X22 $$unsorted) (X23 $$unsorted) (X21 $$unsorted)) (or (tptp.p15 X22 X23) (not (tptp.p15 X21 X22)) (not (tptp.p15 X21 X23)))) (forall ((X15 $$unsorted) (X16 $$unsorted) (X14 $$unsorted)) (or (tptp.p13 X15 X16) (not (tptp.p13 X14 X15)) (not (tptp.p13 X14 X16)))) (forall ((X8 $$unsorted) (X9 $$unsorted) (X7 $$unsorted)) (or (tptp.p12 X8 X9) (not (tptp.p12 X7 X8)) (not (tptp.p12 X7 X9)))) (forall ((X128 $$unsorted) (X129 $$unsorted) (X130 $$unsorted) (X131 $$unsorted)) (or (tptp.p45 X128 X129) (not (tptp.p45 X130 X131)) (not (tptp.p7 X131 X129)) (not (tptp.p19 X130 X128)))) _let_5 (forall ((X138 $$unsorted) (X139 $$unsorted) (X141 $$unsorted) (X140 $$unsorted)) (or (tptp.p46 X138 X139) (not (tptp.p4 X141 X139)) (not (tptp.p46 X140 X141)) (not (tptp.p22 X140 X138)))) _let_4 (forall ((X112 $$unsorted) (X113 $$unsorted)) (tptp.p4 (tptp.f25 (tptp.f28 tptp.c56 (tptp.f31 (tptp.f34 tptp.c57 X112) (tptp.f32 X113 X112))) X113) X113)) (forall ((X3 $$unsorted) (X4 $$unsorted) (X5 $$unsorted) (X6 $$unsorted)) (or (tptp.p10 (tptp.f14 X3 X4) (tptp.f14 X5 X6)) (not (tptp.p12 X3 X5)) (not (tptp.p13 X4 X6)))) (forall ((X162 $$unsorted) (X163 $$unsorted) (X164 $$unsorted) (X165 $$unsorted)) (or (tptp.p7 (tptp.f8 X162 X163) (tptp.f8 X164 X165)) (not (tptp.p6 X162 X164)) (not (tptp.p7 X163 X165)))) (forall ((X155 $$unsorted) (X156 $$unsorted) (X157 $$unsorted) (X158 $$unsorted)) (or (tptp.p6 (tptp.f11 X155 X156) (tptp.f11 X157 X158)) (not (tptp.p10 X156 X158)) (not (tptp.p9 X155 X157)))) (forall ((X121 $$unsorted) (X122 $$unsorted) (X123 $$unsorted) (X124 $$unsorted)) (or (tptp.p41 (tptp.f44 X121 X122) (tptp.f44 X123 X124)) (not (tptp.p43 X121 X123)) (not (tptp.p7 X122 X124)))) (forall ((X114 $$unsorted) (X115 $$unsorted) (X116 $$unsorted) (X117 $$unsorted)) (or (tptp.p4 (tptp.f5 X114 X115) (tptp.f5 X116 X117)) (not (tptp.p2 X114 X116)) (not (tptp.p3 X115 X117)))) (forall ((X108 $$unsorted) (X109 $$unsorted) (X110 $$unsorted) (X111 $$unsorted)) (or (tptp.p4 (tptp.f25 X108 X109) (tptp.f25 X110 X111)) (not (tptp.p24 X108 X110)) (not (tptp.p4 X109 X111)))) _let_3 (forall ((X91 $$unsorted) (X92 $$unsorted) (X93 $$unsorted) (X94 $$unsorted)) (or (tptp.p36 (tptp.f40 X91 X92) (tptp.f40 X93 X94)) (not (tptp.p3 X92 X94)) (not (tptp.p39 X91 X93)))) (forall ((X81 $$unsorted) (X82 $$unsorted) (X83 $$unsorted) (X84 $$unsorted)) (or (tptp.p30 (tptp.f32 X81 X82) (tptp.f32 X83 X84)) (not (tptp.p13 X82 X84)) (not (tptp.p4 X81 X83)))) (forall ((X74 $$unsorted) (X75 $$unsorted) (X76 $$unsorted) (X77 $$unsorted)) (or (tptp.p29 (tptp.f34 X74 X75) (tptp.f34 X76 X77)) (not (tptp.p13 X75 X77)) (not (tptp.p33 X74 X76)))) (forall ((X67 $$unsorted) (X68 $$unsorted) (X69 $$unsorted) (X70 $$unsorted)) (or (tptp.p27 (tptp.f31 X67 X68) (tptp.f31 X69 X70)) (not (tptp.p29 X67 X69)) (not (tptp.p30 X68 X70)))) (forall ((X57 $$unsorted) (X58 $$unsorted) (X59 $$unsorted) (X60 $$unsorted)) (or (tptp.p24 (tptp.f28 X57 X58) (tptp.f28 X59 X60)) (not (tptp.p26 X57 X59)) (not (tptp.p27 X58 X60)))) (forall ((X50 $$unsorted) (X51 $$unsorted) (X52 $$unsorted) (X53 $$unsorted)) (or (tptp.p22 (tptp.f23 X50 X51) (tptp.f23 X52 X53)) (not (tptp.p13 X51 X53)) (not (tptp.p21 X50 X52)))) (forall ((X37 $$unsorted) (X38 $$unsorted) (X39 $$unsorted) (X40 $$unsorted)) (or (tptp.p19 (tptp.f20 X37 X38) (tptp.f20 X39 X40)) (not (tptp.p18 X37 X39)) (not (tptp.p3 X38 X40)))) (forall ((X27 $$unsorted) (X28 $$unsorted) (X29 $$unsorted) (X30 $$unsorted)) (or (tptp.p16 (tptp.f42 X27 X28) (tptp.f42 X29 X30)) (not (tptp.p3 X28 X30)) (not (tptp.p41 X27 X29)))) (forall ((X17 $$unsorted) (X18 $$unsorted) (X19 $$unsorted) (X20 $$unsorted)) (or (tptp.p13 (tptp.f35 X17 X18) (tptp.f35 X19 X20)) (not (tptp.p16 X18 X20)) (not (tptp.p7 X17 X19)))) (forall ((X10 $$unsorted) (X11 $$unsorted) (X12 $$unsorted) (X13 $$unsorted)) (or (tptp.p12 (tptp.f17 X10 X11) (tptp.f17 X12 X13)) (not (tptp.p15 X10 X12)) (not (tptp.p16 X11 X13)))) _let_2 (forall ((X136 $$unsorted) (X137 $$unsorted)) (or (tptp.p45 (tptp.f20 tptp.c52 X136) X137) (not (tptp.p46 (tptp.f23 tptp.c53 (tptp.f35 X137 (tptp.f42 (tptp.f44 tptp.c62 X137) X136))) (tptp.f5 tptp.c49 X136))))) (forall ((X132 $$unsorted) (X133 $$unsorted) (X134 $$unsorted) (X135 $$unsorted)) (let ((_let_1 (tptp.f20 tptp.c52 X132))) (or (tptp.p45 _let_1 (tptp.f8 (tptp.f11 tptp.c54 (tptp.f14 (tptp.f17 tptp.c55 X133) X134)) X135)) (not (tptp.p45 _let_1 X135)) (not (tptp.p46 (tptp.f23 tptp.c53 X134) (tptp.f5 tptp.c49 X132)))))) _let_1))))))))))))))))))))))))))))))))))))))))))))))))))))
% 0.22/0.60  )
% 0.22/0.60  % SZS output end Proof for SYN706-1
% 0.22/0.60  % cvc5---1.0.5 exiting
% 0.22/0.60  % cvc5---1.0.5 exiting
%------------------------------------------------------------------------------