YES # Parallel rule labeling (Zankl et al. 2015). Consider the left-linear TRS R: E(+(x,y)) -> *(E(x),E(y)) E(0()) -> 1() +(x,0()) -> x +(0(),x) -> x *(x,1()) -> x *(1(),x) -> x +(+(x,y),z) -> +(x,+(y,z)) +(x,+(y,z)) -> +(+(x,y),z) +(x,y) -> +(y,x) *(*(x,y),z) -> *(x,*(y,z)) *(x,*(y,z)) -> *(*(x,y),z) *(x,y) -> *(y,x) All parallel critical peaks (except C's) are decreasing wrt rule labeling: phi(E(+(x,y)) -> *(E(x),E(y))) = 9 phi(E(0()) -> 1()) = 1 phi(+(x,0()) -> x) = 3 phi(+(0(),x) -> x) = 4 phi(*(x,1()) -> x) = 2 phi(*(1(),x) -> x) = 1 phi(+(+(x,y),z) -> +(x,+(y,z))) = 13 phi(+(x,+(y,z)) -> +(+(x,y),z)) = 15 phi(+(x,y) -> +(y,x)) = 14 phi(*(*(x,y),z) -> *(x,*(y,z))) = 5 phi(*(x,*(y,z)) -> *(*(x,y),z)) = 7 phi(*(x,y) -> *(y,x)) = 7 psi(E(+(x,y)) -> *(E(x),E(y))) = 8 psi(E(0()) -> 1()) = 1 psi(+(x,0()) -> x) = 6 psi(+(0(),x) -> x) = 12 psi(*(x,1()) -> x) = 5 psi(*(1(),x) -> x) = 8 psi(+(+(x,y),z) -> +(x,+(y,z))) = 10 psi(+(x,+(y,z)) -> +(+(x,y),z)) = 12 psi(+(x,y) -> +(y,x)) = 11 psi(*(*(x,y),z) -> *(x,*(y,z))) = 6 psi(*(x,*(y,z)) -> *(*(x,y),z)) = 4 psi(*(x,y) -> *(y,x)) = 3