(VAR m n u v x y z )
(STRATEGY INNERMOST)
(RULES 
        f(true,x,y,z) -> f(gt(x,plus(y,z)),x,s(y),z)
        f(true,x,y,z) -> f(gt(x,plus(y,z)),x,y,s(z))
        plus(n,0) -> n
        plus(n,s(m)) -> s(plus(n,m))
        gt(0,v) -> false
        gt(s(u),0) -> true
        gt(s(u),s(v)) -> gt(u,v)
        
)