12 lines
142 B
Plaintext
12 lines
142 B
Plaintext
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odd(X,Y) :- r(X,Y).
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odd(X,Y) :- even(X,Z), r(Z,Y).
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even(X,Y) :- odd(X,Z), r(Z,Y).
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r(0,1).
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r(1,2).
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r(2,3).
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r(3,4).
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r(4,5).
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r(X,Y) :- r(Y,X).
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