(VAR x y )
(STRATEGY INNERMOST)
(RULES 
        plus(x,0) -> x
        plus(x,s(y)) -> s(plus(x,y))
        times(0,y) -> 0
        times(x,0) -> 0
        times(s(x),y) -> plus(times(x,y),y)
        p(s(s(x))) -> s(p(s(x)))
        p(s(0)) -> 0
        fac(s(x)) -> times(fac(p(s(x))),s(x))
        
)