YES
Time: 0.007

Problem:
 Equations:
  
 TRS:
  fAC(x,one()) -> x
  fAC(x,x) -> x

Proof:
 AC-KBO Processor:
  precedence:
   one ~ fAC
   weight function:
    [one] = 4,
    
    [fAC](x0, x1) = x0 + x1
   problem:
    Equations:
     
    TRS:
     
   Qed