YES

# Parallel rule labeling (Zankl et al. 2015).

Consider the left-linear TRS R:

  +(s(x),y) -> s(+(x,y))
  +(x,s(y)) -> s(+(x,y))
  +(x,y) -> +(y,x)

All parallel critical peaks (except C's) are decreasing wrt rule labeling:

  phi(+(s(x),y) -> s(+(x,y))) = 3
  phi(+(x,s(y)) -> s(+(x,y))) = 4
  phi(+(x,y) -> +(y,x)) = 1

  psi(+(s(x),y) -> s(+(x,y))) = 2
  psi(+(x,s(y)) -> s(+(x,y))) = 2
  psi(+(x,y) -> +(y,x)) = 2