(VAR x y )
(RULES 
        f(true,x,y) -> f(gt(x,y),plus2(x),plus1(y))
        gt(s(x),0) -> true
        gt(0,y) -> false
        gt(s(x),s(y)) -> gt(x,y)
        plus1(x) -> s(x)
        plus2(x) -> s(s(x))
        
)