  An orthogonal approach to the fuzzification of both multisets and hybrid sets
is presented. In particular, we introduce L-multi-fuzzy and L-fuzzy hybrid
sets, which are general enough and in spirit with the basic concepts of fuzzy
set theory. In addition, we study the properties of these structures. Also, the
usefulness of these structures is examined in the framework of mechanical
multiset processing. More specifically, we introduce a variant of fuzzy P
systems and, since simple fuzzy membrane systems have been introduced
elsewhere, we simply extend previously stated results and ideas.
