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