YES 1 decompositions #0 ----------- 1: +(0(),y) -> y 2: +(s(0()),y) -> s(y) 3: s(s(x)) -> x @Strongly Commuting --- R 1: +(0(),y) -> y 2: +(s(0()),y) -> s(y) 3: s(s(x)) -> x --- S 1: +(0(),y) -> y 2: +(s(0()),y) -> s(y) 3: s(s(x)) -> x