(from AG01 3.51) (VAR x) (RULES f(f(x)) -> f(c(f(x))) f(f(x)) -> f(d(f(x))) g(c(x)) -> x g(d(x)) -> x g(c(h(0))) -> g(d(1)) g(c(1)) -> g(d(h(0))) g(h(x)) -> g(x) )
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