(VAR x1 )
(RULES 
        p(0(x1)) -> s(s(0(s(s(p(x1))))))
        p(s(0(x1))) -> 0(x1)
        p(s(s(x1))) -> s(p(s(x1)))
        f(s(x1)) -> g(q(i(x1)))
        g(x1) -> f(p(p(x1)))
        q(i(x1)) -> q(s(x1))
        q(s(x1)) -> s(s(x1))
        i(x1) -> s(x1)
        
)