Set of Mappings can be Ordered by Subset Relation

Theorem
Let $S \times T$ be the product of two sets.

Let $\FF$ be a set of mappings on $S \times T$.

Then $\FF$ can be ordered by inclusion.

Proof
By the definition of mapping, a mapping is a specific type of relation.

The result then follows from Set of Relations can be Ordered by Inclusion.