TSTP Solution File: LCL644+1.015 by Twee---2.4.2

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Twee---2.4.2
% Problem  : LCL644+1.015 : TPTP v8.1.2. Released v4.0.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof

% Computer : n010.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 Aug 31 08:19:41 EDT 2023

% Result   : Theorem 7.60s 1.39s
% Output   : Proof 9.16s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.14  % Problem  : LCL644+1.015 : TPTP v8.1.2. Released v4.0.0.
% 0.15/0.15  % Command  : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof
% 0.15/0.36  % Computer : n010.cluster.edu
% 0.15/0.36  % Model    : x86_64 x86_64
% 0.15/0.36  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.15/0.36  % Memory   : 8042.1875MB
% 0.15/0.36  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.15/0.36  % CPULimit : 300
% 0.15/0.36  % WCLimit  : 300
% 0.15/0.36  % DateTime : Fri Aug 25 06:41:20 EDT 2023
% 0.22/0.36  % CPUTime  : 
% 7.60/1.38  Command-line arguments: --lhs-weight 9 --flip-ordering --complete-subsets --normalise-queue-percent 10 --cp-renormalise-threshold 10
% 7.60/1.39  
% 7.60/1.39  % SZS status Theorem
% 7.60/1.39  
% 7.60/1.39  % SZS output start Proof
% 7.60/1.39  Take the following subset of the input axioms:
% 9.16/1.70    fof(main, conjecture, ~?[X]: ~(~(![Y]: (~r1(X, Y) | (~(p16(Y) & ![X2]: (~r1(Y, X2) | p16(X2))) | p15(Y))) | (![Y2]: (~r1(X, Y2) | (p16(Y2) | ~(p15(Y2) & (![X2]: (~r1(Y2, X2) | p15(X2)) & p15(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p16(X2) & ![Y3]: (~r1(X2, Y3) | p16(Y3))) | p15(X2))) | (p16(Y2) | ~(p15(Y2) & (![X2]: (~r1(Y2, X2) | p15(X2)) & p15(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p16(Y2) & ![X2]: (~r1(Y2, X2) | p16(X2))) | (p15(Y2) | ![X2]: (~r1(Y2, X2) | (p16(X2) | ~(p15(X2) & (![Y3]: (~r1(X2, Y3) | p15(Y3)) & p15(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p16(Y2) & ![X2]: (~r1(Y2, X2) | p16(X2))) | (p15(Y2) | (p16(Y2) | ~(p15(Y2) & (![X2]: (~r1(Y2, X2) | p15(X2)) & p15(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p15(Y2) & ![X2]: (~r1(Y2, X2) | p15(X2))) | p14(Y2))) | (![Y2]: (~r1(X, Y2) | (p15(Y2) | ~(p14(Y2) & (![X2]: (~r1(Y2, X2) | p14(X2)) & p14(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p15(X2) & ![Y3]: (~r1(X2, Y3) | p15(Y3))) | p14(X2))) | (p15(Y2) | ~(p14(Y2) & (![X2]: (~r1(Y2, X2) | p14(X2)) & p14(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p15(Y2) & ![X2]: (~r1(Y2, X2) | p15(X2))) | (p14(Y2) | ![X2]: (~r1(Y2, X2) | (p15(X2) | ~(p14(X2) & (![Y3]: (~r1(X2, Y3) | p14(Y3)) & p14(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p15(Y2) & ![X2]: (~r1(Y2, X2) | p15(X2))) | (p14(Y2) | (p15(Y2) | ~(p14(Y2) & (![X2]: (~r1(Y2, X2) | p14(X2)) & p14(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p14(Y2) & ![X2]: (~r1(Y2, X2) | p14(X2))) | p13(Y2))) | (![Y2]: (~r1(X, Y2) | (p14(Y2) | ~(p13(Y2) & (![X2]: (~r1(Y2, X2) | p13(X2)) & p13(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p14(X2) & ![Y3]: (~r1(X2, Y3) | p14(Y3))) | p13(X2))) | (p14(Y2) | ~(p13(Y2) & (![X2]: (~r1(Y2, X2) | p13(X2)) & p13(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p14(Y2) & ![X2]: (~r1(Y2, X2) | p14(X2))) | (p13(Y2) | ![X2]: (~r1(Y2, X2) | (p14(X2) | ~(p13(X2) & (![Y3]: (~r1(X2, Y3) | p13(Y3)) & p13(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p14(Y2) & ![X2]: (~r1(Y2, X2) | p14(X2))) | (p13(Y2) | (p14(Y2) | ~(p13(Y2) & (![X2]: (~r1(Y2, X2) | p13(X2)) & p13(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p13(Y2) & ![X2]: (~r1(Y2, X2) | p13(X2))) | p12(Y2))) | (![Y2]: (~r1(X, Y2) | (p13(Y2) | ~(p12(Y2) & (![X2]: (~r1(Y2, X2) | p12(X2)) & p12(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p13(X2) & ![Y3]: (~r1(X2, Y3) | p13(Y3))) | p12(X2))) | (p13(Y2) | ~(p12(Y2) & (![X2]: (~r1(Y2, X2) | p12(X2)) & p12(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p13(Y2) & ![X2]: (~r1(Y2, X2) | p13(X2))) | (p12(Y2) | ![X2]: (~r1(Y2, X2) | (p13(X2) | ~(p12(X2) & (![Y3]: (~r1(X2, Y3) | p12(Y3)) & p12(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p13(Y2) & ![X2]: (~r1(Y2, X2) | p13(X2))) | (p12(Y2) | (p13(Y2) | ~(p12(Y2) & (![X2]: (~r1(Y2, X2) | p12(X2)) & p12(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p12(Y2) & ![X2]: (~r1(Y2, X2) | p12(X2))) | p11(Y2))) | (![Y2]: (~r1(X, Y2) | (p12(Y2) | ~(p11(Y2) & (![X2]: (~r1(Y2, X2) | p11(X2)) & p11(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p12(X2) & ![Y3]: (~r1(X2, Y3) | p12(Y3))) | p11(X2))) | (p12(Y2) | ~(p11(Y2) & (![X2]: (~r1(Y2, X2) | p11(X2)) & p11(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p12(Y2) & ![X2]: (~r1(Y2, X2) | p12(X2))) | (p11(Y2) | ![X2]: (~r1(Y2, X2) | (p12(X2) | ~(p11(X2) & (![Y3]: (~r1(X2, Y3) | p11(Y3)) & p11(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p12(Y2) & ![X2]: (~r1(Y2, X2) | p12(X2))) | (p11(Y2) | (p12(Y2) | ~(p11(Y2) & (![X2]: (~r1(Y2, X2) | p11(X2)) & p11(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p11(Y2) & ![X2]: (~r1(Y2, X2) | p11(X2))) | p10(Y2))) | (![Y2]: (~r1(X, Y2) | (p11(Y2) | ~(p10(Y2) & (![X2]: (~r1(Y2, X2) | p10(X2)) & p10(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p11(X2) & ![Y3]: (~r1(X2, Y3) | p11(Y3))) | p10(X2))) | (p11(Y2) | ~(p10(Y2) & (![X2]: (~r1(Y2, X2) | p10(X2)) & p10(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p11(Y2) & ![X2]: (~r1(Y2, X2) | p11(X2))) | (p10(Y2) | ![X2]: (~r1(Y2, X2) | (p11(X2) | ~(p10(X2) & (![Y3]: (~r1(X2, Y3) | p10(Y3)) & p10(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p11(Y2) & ![X2]: (~r1(Y2, X2) | p11(X2))) | (p10(Y2) | (p11(Y2) | ~(p10(Y2) & (![X2]: (~r1(Y2, X2) | p10(X2)) & p10(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p10(Y2) & ![X2]: (~r1(Y2, X2) | p10(X2))) | p9(Y2))) | (![Y2]: (~r1(X, Y2) | (p10(Y2) | ~(p9(Y2) & (![X2]: (~r1(Y2, X2) | p9(X2)) & p9(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p10(X2) & ![Y3]: (~r1(X2, Y3) | p10(Y3))) | p9(X2))) | (p10(Y2) | ~(p9(Y2) & (![X2]: (~r1(Y2, X2) | p9(X2)) & p9(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p10(Y2) & ![X2]: (~r1(Y2, X2) | p10(X2))) | (p9(Y2) | ![X2]: (~r1(Y2, X2) | (p10(X2) | ~(p9(X2) & (![Y3]: (~r1(X2, Y3) | p9(Y3)) & p9(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p10(Y2) & ![X2]: (~r1(Y2, X2) | p10(X2))) | (p9(Y2) | (p10(Y2) | ~(p9(Y2) & (![X2]: (~r1(Y2, X2) | p9(X2)) & p9(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p9(Y2) & ![X2]: (~r1(Y2, X2) | p9(X2))) | p8(Y2))) | (![Y2]: (~r1(X, Y2) | (p9(Y2) | ~(p8(Y2) & (![X2]: (~r1(Y2, X2) | p8(X2)) & p8(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p9(X2) & ![Y3]: (~r1(X2, Y3) | p9(Y3))) | p8(X2))) | (p9(Y2) | ~(p8(Y2) & (![X2]: (~r1(Y2, X2) | p8(X2)) & p8(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p9(Y2) & ![X2]: (~r1(Y2, X2) | p9(X2))) | (p8(Y2) | ![X2]: (~r1(Y2, X2) | (p9(X2) | ~(p8(X2) & (![Y3]: (~r1(X2, Y3) | p8(Y3)) & p8(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p9(Y2) & ![X2]: (~r1(Y2, X2) | p9(X2))) | (p8(Y2) | (p9(Y2) | ~(p8(Y2) & (![X2]: (~r1(Y2, X2) | p8(X2)) & p8(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p8(Y2) & ![X2]: (~r1(Y2, X2) | p8(X2))) | p7(Y2))) | (![Y2]: (~r1(X, Y2) | (p8(Y2) | ~(p7(Y2) & (![X2]: (~r1(Y2, X2) | p7(X2)) & p7(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p8(X2) & ![Y3]: (~r1(X2, Y3) | p8(Y3))) | p7(X2))) | (p8(Y2) | ~(p7(Y2) & (![X2]: (~r1(Y2, X2) | p7(X2)) & p7(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p8(Y2) & ![X2]: (~r1(Y2, X2) | p8(X2))) | (p7(Y2) | ![X2]: (~r1(Y2, X2) | (p8(X2) | ~(p7(X2) & (![Y3]: (~r1(X2, Y3) | p7(Y3)) & p7(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p8(Y2) & ![X2]: (~r1(Y2, X2) | p8(X2))) | (p7(Y2) | (p8(Y2) | ~(p7(Y2) & (![X2]: (~r1(Y2, X2) | p7(X2)) & p7(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p7(Y2) & ![X2]: (~r1(Y2, X2) | p7(X2))) | p6(Y2))) | (![Y2]: (~r1(X, Y2) | (p7(Y2) | ~(p6(Y2) & (![X2]: (~r1(Y2, X2) | p6(X2)) & p6(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p7(X2) & ![Y3]: (~r1(X2, Y3) | p7(Y3))) | p6(X2))) | (p7(Y2) | ~(p6(Y2) & (![X2]: (~r1(Y2, X2) | p6(X2)) & p6(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p7(Y2) & ![X2]: (~r1(Y2, X2) | p7(X2))) | (p6(Y2) | ![X2]: (~r1(Y2, X2) | (p7(X2) | ~(p6(X2) & (![Y3]: (~r1(X2, Y3) | p6(Y3)) & p6(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p7(Y2) & ![X2]: (~r1(Y2, X2) | p7(X2))) | (p6(Y2) | (p7(Y2) | ~(p6(Y2) & (![X2]: (~r1(Y2, X2) | p6(X2)) & p6(Y2))))))))))) | (![Y2]: (~r1(X, Y2) | (p15(Y2) | ~(![X2]: (~r1(Y2, X2) | p15(X2)) & p15(Y2)))) | (![Y2]: (~r1(X, Y2) | (p15(Y2) | ~(![X2]: (~r1(Y2, X2) | p15(X2)) & p15(Y2)))) | (~(![Y2]: (~r1(X, Y2) | (~(p6(Y2) & ![X2]: (~r1(Y2, X2) | p6(X2))) | p5(Y2))) | (![Y2]: (~r1(X, Y2) | (p6(Y2) | ~(p5(Y2) & (![X2]: (~r1(Y2, X2) | p5(X2)) & p5(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p6(X2) & ![Y3]: (~r1(X2, Y3) | p6(Y3))) | p5(X2))) | (p6(Y2) | ~(p5(Y2) & (![X2]: (~r1(Y2, X2) | p5(X2)) & p5(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p6(Y2) & ![X2]: (~r1(Y2, X2) | p6(X2))) | (p5(Y2) | ![X2]: (~r1(Y2, X2) | (p6(X2) | ~(p5(X2) & (![Y3]: (~r1(X2, Y3) | p5(Y3)) & p5(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p6(Y2) & ![X2]: (~r1(Y2, X2) | p6(X2))) | (p5(Y2) | (p6(Y2) | ~(p5(Y2) & (![X2]: (~r1(Y2, X2) | p5(X2)) & p5(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p5(Y2) & ![X2]: (~r1(Y2, X2) | p5(X2))) | p4(Y2))) | (![Y2]: (~r1(X, Y2) | (p5(Y2) | ~(p4(Y2) & (![X2]: (~r1(Y2, X2) | p4(X2)) & p4(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p5(X2) & ![Y3]: (~r1(X2, Y3) | p5(Y3))) | p4(X2))) | (p5(Y2) | ~(p4(Y2) & (![X2]: (~r1(Y2, X2) | p4(X2)) & p4(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p5(Y2) & ![X2]: (~r1(Y2, X2) | p5(X2))) | (p4(Y2) | ![X2]: (~r1(Y2, X2) | (p5(X2) | ~(p4(X2) & (![Y3]: (~r1(X2, Y3) | p4(Y3)) & p4(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p5(Y2) & ![X2]: (~r1(Y2, X2) | p5(X2))) | (p4(Y2) | (p5(Y2) | ~(p4(Y2) & (![X2]: (~r1(Y2, X2) | p4(X2)) & p4(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p4(Y2) & ![X2]: (~r1(Y2, X2) | p4(X2))) | p3(Y2))) | (![Y2]: (~r1(X, Y2) | (p4(Y2) | ~(p3(Y2) & (![X2]: (~r1(Y2, X2) | p3(X2)) & p3(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p4(X2) & ![Y3]: (~r1(X2, Y3) | p4(Y3))) | p3(X2))) | (p4(Y2) | ~(p3(Y2) & (![X2]: (~r1(Y2, X2) | p3(X2)) & p3(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p4(Y2) & ![X2]: (~r1(Y2, X2) | p4(X2))) | (p3(Y2) | ![X2]: (~r1(Y2, X2) | (p4(X2) | ~(p3(X2) & (![Y3]: (~r1(X2, Y3) | p3(Y3)) & p3(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p4(Y2) & ![X2]: (~r1(Y2, X2) | p4(X2))) | (p3(Y2) | (p4(Y2) | ~(p3(Y2) & (![X2]: (~r1(Y2, X2) | p3(X2)) & p3(Y2))))))))))) | (~(![Y2]: (~r1(X, Y2) | (~(p3(Y2) & ![X2]: (~r1(Y2, X2) | p3(X2))) | p2(Y2))) | (![Y2]: (~r1(X, Y2) | (p3(Y2) | ~(p2(Y2) & (![X2]: (~r1(Y2, X2) | p2(X2)) & p2(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p3(X2) & ![Y3]: (~r1(X2, Y3) | p3(Y3))) | p2(X2))) | (p3(Y2) | ~(p2(Y2) & (![X2]: (~r1(Y2, X2) | p2(X2)) & p2(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p3(Y2) & ![X2]: (~r1(Y2, X2) | p3(X2))) | (p2(Y2) | ![X2]: (~r1(Y2, X2) | (p3(X2) | ~(p2(X2) & (![Y3]: (~r1(X2, Y3) | p2(Y3)) & p2(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p3(Y2) & ![X2]: (~r1(Y2, X2) | p3(X2))) | (p2(Y2) | (p3(Y2) | ~(p2(Y2) & (![X2]: (~r1(Y2, X2) | p2(X2)) & p2(Y2))))))))))) | ~(![Y2]: (~r1(X, Y2) | (~(p2(Y2) & ![X2]: (~r1(Y2, X2) | p2(X2))) | p1(Y2))) | (![Y2]: (~r1(X, Y2) | (p2(Y2) | ~(p1(Y2) & (![X2]: (~r1(Y2, X2) | p1(X2)) & p1(Y2))))) | ~(![Y2]: (~r1(X, Y2) | (![X2]: (~r1(Y2, X2) | (~(p2(X2) & ![Y3]: (~r1(X2, Y3) | p2(Y3))) | p1(X2))) | (p2(Y2) | ~(p1(Y2) & (![X2]: (~r1(Y2, X2) | p1(X2)) & p1(Y2)))))) & (![Y2]: (~r1(X, Y2) | (~(p2(Y2) & ![X2]: (~r1(Y2, X2) | p2(X2))) | (p1(Y2) | ![X2]: (~r1(Y2, X2) | (p2(X2) | ~(p1(X2) & (![Y3]: (~r1(X2, Y3) | p1(Y3)) & p1(X2)))))))) & ![Y2]: (~r1(X, Y2) | (~(p2(Y2) & ![X2]: (~r1(Y2, X2) | p2(X2))) | (p1(Y2) | (p2(Y2) | ~(p1(Y2) & (![X2]: (~r1(Y2, X2) | p1(X2)) & p1(Y2)))))))))))))))))))))))))))).
% 9.16/1.70  
% 9.16/1.70  Now clausify the problem and encode Horn clauses using encoding 3 of
% 9.16/1.70  http://www.cse.chalmers.se/~nicsma/papers/horn.pdf.
% 9.16/1.70  We repeatedly replace C & s=t => u=v by the two clauses:
% 9.16/1.70    fresh(y, y, x1...xn) = u
% 9.16/1.70    C => fresh(s, t, x1...xn) = v
% 9.16/1.70  where fresh is a fresh function symbol and x1..xn are the free
% 9.16/1.70  variables of u and v.
% 9.16/1.70  A predicate p(X) is encoded as p(X)=true (this is sound, because the
% 9.16/1.70  input problem has no model of domain size 1).
% 9.16/1.70  
% 9.16/1.70  The encoding turns the above axioms into the following unit equations and goals:
% 9.16/1.70  
% 9.16/1.70  Axiom 1 (main_2): p15(y17) = true.
% 9.16/1.70  Axiom 2 (main_3): p15(y16) = true.
% 9.16/1.70  
% 9.16/1.70  Goal 1 (main_166): p15(y16) = true.
% 9.16/1.70  Proof:
% 9.16/1.70    p15(y16)
% 9.16/1.70  = { by axiom 2 (main_3) }
% 9.16/1.70    true
% 9.16/1.70  
% 9.16/1.70  Goal 2 (main_165): p15(y17) = true.
% 9.16/1.70  Proof:
% 9.16/1.70    p15(y17)
% 9.16/1.70  = { by axiom 1 (main_2) }
% 9.16/1.70    true
% 9.16/1.70  % SZS output end Proof
% 9.16/1.70  
% 9.16/1.70  RESULT: Theorem (the conjecture is true).
%------------------------------------------------------------------------------