This document provides information about an academic writing course for graduate students, including details on a lesson comparing how commas can change the meaning of two "Dear Jack" letters from Jill. In the first letter, commas are used properly and Jill expresses her love for Jack and desire to be with him. In the second letter, without commas in different places, Jill comes across as having no feelings for Jack and instead yearning for other men when they are apart.