What is the difference between "Books & Materials not required to be purchased from the school" and "Other book & course-related material"

Working on Education Tax Credit.  Specific question Turbotax is asking is:

"Did student pay for book or materials to attend school?"

It asks for "Books & materials not required to be purchased form the school" and then it asks for "Other book & course-related material".  What is the difference between these 2 items????