(from AG01 3.22) (VAR x y z) (RULES times(x,plus(y,s(z))) -> plus(times(x,plus(y,times(s(z),0))),times(x,s(z))) times(x,0) -> 0 times(x,s(y)) -> plus(times(x,y),x) plus(x,0) -> x plus(x,s(y)) -> s(plus(x,y)))
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