  This paper serves as an example to show the way we pass from ordered
groupoids (ordered semigroups) to ordered hypergroupoids (ordered
hypersemigroups), from groupoids (semigroups) to hypergroupoids
(hypersemigroups). The results on semigroups (or on ordered semigroup) can be
transferred to hypersemigroups (or to ordered hypersemigroups) in the way
indicated in the present paper.
