(VAR x y) (RULES s(p(x)) -> x p(s(x)) -> x +(x,0) -> x +(x,s(y)) -> s(+(x,y)) +(x,p(y)) -> p(+(x,y)) -(x,0) -> x -(x,s(y)) -> p(-(x,y)) -(x,p(y)) -> s(-(x,y)) ) (COMMENT experiments for [36] submitted by: Takahito Aoto )