(VAR m n u v x y z )
(RULES 
        div(x, s(y)) -> d(x, s(y), 0)
        d(x, s(y), z) -> cond(ge(x, z), x, y, z)
        cond(true, x, y, z) -> s(d(x, s(y), plus(s(y), z)))
        cond(false, x, y, z) -> 0
        ge(u, 0) -> true
        ge(0, s(v)) -> false
        ge(s(u), s(v)) -> ge(u, v)
        plus(n, 0) -> n
        plus(n, s(m)) -> s(plus(n, m))
        
)