(VAR x y z )
(RULES 
        quot(0, s(y), s(z)) -> 0
        quot(s(x), s(y), z) -> quot(x, y, z)
        plus(0, y) -> y
        plus(s(x), y) -> s(plus(x, y))
        quot(x, 0, s(z)) -> s(quot(x, plus(z, s(0)), s(z)))
        
)