  The paper fills gaps in knowledge about Kuratowski operations which are
already in the literature. The Cayley table for these operations has been drawn
up. Techniques, using only paper and pencil, to point out all semigroups and
its isomorphic types are applied. Some results apply only to topology, one can
not bring them out, using only properties of the complement and a closure-like
operation. The arguments are by systematic study of possibilities.
