Let's take a look at a real example from test 71. Pause the recording, try this problem on your own for about a minute and a half, and then on pause when you're ready to talk about it. This is a very atypical phrasing for a must be false type of question. It's talking about violating the principle. The word principle almost always means a conditional claim on LSAT. So must be false would have us thinking conditional, and principle would also have us thinking conditional. Sure enough, the word unless is there.