There is no TN under B in the braille…
I assume the TN on the TN page explains the parens around include as well…it’s a little hard to tell from your notes above.
The basic exercise format is correct. As for the rest, there are no specific rules that apply, but I think you’ve come up with a workable solution applying the rules where you can and making modifications where there are no rules. Another suggestion (which would require a TN) is to use italics, bold or some type of grouping indicator for the letters within the answer word include.
Cindi