YES
Time: 0.010

Problem:
 Equations:
  orAC(orAC(x2,x3),x4) -> orAC(x2,orAC(x3,x4))
  orAC(x2,x3) -> orAC(x3,x2)
  andAC(andAC(x2,x3),x4) -> andAC(x2,andAC(x3,x4))
  andAC(x2,x3) -> andAC(x3,x2)
  orAC(x2,orAC(x3,x4)) -> orAC(orAC(x2,x3),x4)
  orAC(x3,x2) -> orAC(x2,x3)
  andAC(x2,andAC(x3,x4)) -> andAC(andAC(x2,x3),x4)
  andAC(x3,x2) -> andAC(x2,x3)
 TRS:
  not(not(x)) -> x
  orAC(not(x),not(y)) -> not(andAC(x,y))

Proof:
 AC-RPO Processor:
  precedence:
   orAC > not > andAC
  status:
   
  problem:
   Equations:
    orAC(orAC(x2,x3),x4) -> orAC(x2,orAC(x3,x4))
    orAC(x2,x3) -> orAC(x3,x2)
    andAC(andAC(x2,x3),x4) -> andAC(x2,andAC(x3,x4))
    andAC(x2,x3) -> andAC(x3,x2)
    orAC(x2,orAC(x3,x4)) -> orAC(orAC(x2,x3),x4)
    orAC(x3,x2) -> orAC(x2,x3)
    andAC(x2,andAC(x3,x4)) -> andAC(andAC(x2,x3),x4)
    andAC(x3,x2) -> andAC(x2,x3)
   TRS:
    
  Qed