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? Define a predicate minus (X,Y) such that for instance, minus (0, Z). Z = = 0 ? minus(s(s(0)), Z). Z = p(p(0)) ?-
? Define a predicate minus (X,Y) such that for instance, minus (0, Z). Z = = 0 ? minus(s(s(0)), Z). Z = p(p(0)) ?- minus(s(p(0)), Z). Z = 0 ?- minus (p(s(p(0))), Z). Z = s(0) so that Z takes the form sn (0) or pn (0) for some n 0.
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