(VAR x y) (RULES -(x, 0) -> x -(s(x), s(y)) -> -(x, y) p(s(x)) -> x f(s(x), y) -> f(p(-(s(x), y)), p(-(y, s(x)))) f(x, s(y)) -> f(p(-(x, s(y))), p(-(s(y), x))) )
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