Sets of Operations on Set of 3 Elements/Automorphism Group of A

Theorem
Let $S = \set {a, b, c}$ be a set with $3$ elements.

Let $\AA$ be the set of all operations $\circ$ on $S$ such that the groups of automorphisms of $\struct {S, \circ}$ are the symmetric group on $S$, that is, $\map \Gamma S$.

Then:
 * $\AA$ has $3$ elements.