Suppose someone has flagged a question for being a duplicate, should I also flag it as duplicate, or does the one flag suffice? (And does this change if it's a duplicate of two questions or more?)
Also, in relation to that, when reviewing first questions, marking as duplicate can be enough for a review (In my opinion). However, if someone marks it as duplicate (Assuming I shouldn't flag again), and I have nothing else to do regarding that post, is the "Nothing to do" review fine? As there's nothing for ME to do about it, since it was already done?