MAYBE
Time: 2.409

Problem:
 Equations:
  
 TRS:
  le(0(),y) -> true()
  le(s(x),0()) -> false()
  le(s(x),s(y)) -> le(x,y)
  pred(s(x)) -> x
  minus(x,0()) -> x
  minus(x,s(y)) -> pred(minus(x,y))
  gcdC(0(),y) -> y
  gcdC(s(x),0()) -> s(x)
  gcdC(s(x),s(y)) -> if_gcd(le(y,x),s(x),s(y))
  if_gcd(true(),s(x),s(y)) -> gcdC(minus(x,y),s(y))
  if_gcd(false(),s(x),s(y)) -> gcdC(minus(y,x),s(x))

Proof:
 Open