“…For n = 2 (n = 3), the variety of n-tuple semigroups contains commutative dimonoids (commutative trioids). We remind that dimonoids and trioids were introduced in [14] and [15], respectively, and studied, e.g., in [11,23,24,26,31,32,34,43]. The algebras, which retained quite a few properties of 2-tuple semigroups, turned out to be bisemigroups [22] and restrictive bisemigroups [21].…”