Input TRS:
    1: app(nil(),y) -> y
    2: app(add(n,x),y) -> add(n,app(x,y))
    3: reverse(nil()) -> nil()
    4: reverse(add(n,x)) -> app(reverse(x),add(n,nil()))
    5: shuffle(nil()) -> nil()
    6: shuffle(add(n,x)) -> add(n,shuffle(reverse(x)))
Number of Rules: 6
Direct QWPOS(max) ... failed.