Definitely helpful

Ok, so it appears I interpreted "B or R" to be "either B or R", when that's not correct. In normal English (or perhaps just my use of it), I would think of it like, "you can sit in this seat or that seat (but not both)". But in a more technically correct form of English, it sounds like we would need to change that sentence to "either this seat or that seat" to imply that one cannot do both, right?

In Question 2, with the clause that "Joffrey must kill Bran or Robb", we turn that into /B > R, or /R > B. But why doesn't that also turn into R > /B and B > /R? Seems like it should be a two-way street, no?

I agree, it seemed that the second sentence especially was supportive of the first under the idea that libraries and bookstores have a "wide range of books on various subjects."