YES

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

Consider the left-linear TRS R:

  s(p(x)) -> x
  p(s(x)) -> x

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

  phi(s(p(x)) -> x) = 1
  phi(p(s(x)) -> x) = 1

  psi(s(p(x)) -> x) = 1
  psi(p(s(x)) -> x) = 1