defplus(l: (A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R), r: (A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R)): (A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R)
defsumOption(to: TraversableOnce[(A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R)]): Option[(A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R)]
override this if there is a faster way to do this sum than reduceLeftOption on plus
override this if there is a faster way to do this sum than reduceLeftOption on plus
Combine 18 semigroups into a product semigroup