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tak.pl
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1990-05-25
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437b
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24 lines
% generated: 17 November 1989
% option(s): SOURCE_TRANSFORM_1
%
% tak
%
% Evan Tick (from Lisp version by R. P. Gabriel)
%
% (almost) Takeuchi function (recursive arithmetic)
tak :- tak(18,12,6,_).
tak(X,Y,Z,A) :-
X =< Y,
Z = A.
tak(X,Y,Z,A) :-
X > Y,
X1 is X - 1,
tak(X1,Y,Z,A1),
Y1 is Y - 1,
tak(Y1,Z,X,A2),
Z1 is Z - 1,
tak(Z1,X,Y,A3),
tak(A1,A2,A3,A).