TRS:
 {    fib(0()) -> 0(),
   fib(s(0())) -> s(0()),
  fib(s(s(x))) -> +(fib(s(x)), fib(x))}
 RPO Product:
  Quasi-Precedence:
  empty
  
  Qed


TRS:
 {    fib(0()) -> 0(),
   fib(s(0())) -> s(0()),
  fib(s(s(x))) -> +(fib(s(x)), fib(x))}
 Fail