Note: Homework problem 7 from Chapter 8 might seem a little vague as written:

"How many different disaccharides of D-glucopyranose are possible?"

You should assume that all linkages between the glucose molecules
involve at least one Carbon-1, i.e. an anomeric carbon. Also assume
that both alpha and beta anomers are available to form the dimers.
You should try to name all 19.
For example: alpha (1->2) beta