[X,Y]

plus(0,Y) -> Y.
plus(s(X),Y) -> s(plus(X,Y)).
min(X,0) -> X.
min(s(X),s(Y)) -> min(X,Y).
min(min(X,Y),Z) -> min(X,plus(Y,Z)).
quot(0,s(Y)) -> 0.
quot(s(X),s(Y)) -> s(quot(min(X,Y),s(Y))).

