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Btw, with your experience, have you ever faced with a question that requires this "helpful..." consideration to solve? (I mean, a question that cannot be answered without considering this issue). If yes, then I am glad that you could point it out. This will help a lot. Thanks.
Nope, I've never seen a case where you absolutely have to figure out which of these "helpful..." idioms is correct. I suppose that there's no reason why they couldn't test it explicitly, but they have
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