MAYBE
Time: 1.163

Problem:
 Equations:
  plusAC(plusAC(x3,x4),x5) -> plusAC(x3,plusAC(x4,x5))
  plusAC(x3,x4) -> plusAC(x4,x3)
  plusAC(x3,plusAC(x4,x5)) -> plusAC(plusAC(x3,x4),x5)
  plusAC(x4,x3) -> plusAC(x3,x4)
 TRS:
  minus(x,0()) -> x
  minus(s(x),s(y)) -> minus(x,y)
  minus(minus(x,y),z) -> minus(x,plusAC(y,z))
  quot(0(),s(y)) -> 0()
  quot(s(x),s(y)) -> s(quot(minus(x,y),s(y)))
  plusAC(0(),y) -> y
  plusAC(s(x),y) -> s(plusAC(x,y))

Proof:
 Open