Write the complete mechanism for the aldol condensation of acetophenone catalyzed by an acid.

Mechanism of aldol condensation of acetophenone under acid catalysis, showing reaction steps.

Continuation of aldol condensation mechanism for acetophenone, illustrating further reaction steps.

Detailed steps of aldol condensation mechanism for acetophenone, highlighting proton transfers.

Final steps of aldol condensation mechanism for acetophenone, showing product formation.