It doesn't matter. In this case, the directions are in the form of a numbered item. So treat that as any other numbered item in this particular exercise, have a blank line after it and treat these as a matching exercises and follow 10.9 and 10.9.1 and 10.9.2 and anything else there. See the examples given for this also. It looks like this might fit across the page, but you'll have to try it. I can't always tell by looking. So, this is matching and don't treat these as subentries. Only the left (or first) column is lettered, just like in print. And insert a blank line after before going on to the next question.