MAYBE
MAYBE
TRS:
 {
       minus(minus(x)) -> x,
  +(minus(x), +(x, y)) -> y,
  +(+(x, y), minus(y)) -> x,
        minux(+(x, y)) -> +(minus(y), minus(x))
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
         minus(minus(x)) -> x,
    +(minus(x), +(x, y)) -> y,
    +(+(x, y), minus(y)) -> x,
          minux(+(x, y)) -> +(minus(y), minus(x))
   }
  Fail