#Help

Hey guys, I'm having difficulty understanding this question. It states:

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I am having a hard time understanding Frank's argument. I know Lance is saying the minimum experiences teach us is that every general rule has at least one exception. But what I don't understand is how Frank came to the conclusion that there is at least one general rule that has no exceptions.. If anyone can explain, it'd be super helpful :)

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https://classic.7sage.com/lsat_explanations/lsat-56-section-2-question-11/