Input TRS:
    1: dfib(s(s(x)),y) -> dfib(s(x),dfib(x,y))
Number of strict rules: 1
Direct Order(PosReal,>,Poly) ... removes: 1
     s(x1)	weight: (/ 1 8) + 2 * x1
  dfib(x1,x2)	weight: (/ 1 8) + x1 + x2
Number of strict rules: 0
YES