Subsets Algorithm

That is, all components of A are also components of B. A and B may be equal; if they are unequal, then A is a proper subset of B. The relationship of one set being a subset of another is named inclusion or sometimes containment. In fact, the subsets of a given set form a Boolean algebra under the subset relation, in which the join and meet are given by intersection and union, and the subset relation itself is the Boolean inclusion relation.

Subsets source code, pseudocode and analysis