Doesn't this answer assume that there is A,B, and X? Just because if not A then not B and most of B is X does not imply that there is any B at all. If there is no B, then we cannot come to the conclusion that some of A is X. If it was explicitly stated that there was B, then we can come to this conclusion, but most of 0 is still 0. How can we come to this sort of implicit assumption during the test without also making other faulty assumptions?
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