We know that J week 1 must be F, since F must be in J before it is in R. We also know that none of the experts can be in J until they are in R, and the only expert in R so far is X, which we know is 4th in J. So, none of the experts can be the second slot in J. Therefore, it must be one of the intro textbooks in slot 2 of J, and since F is already in 1, it must be either G or H.