The statement mentions that if the people ask about the tailor, your suit is good. This means that people ask only in the situation when the thing is good. So, I is implicit. The criteria of an excellent suit is not mentioned. So, II is not implicit.
Statement: You know that your suit is excellent when people ask about your tailor who tailored the suit. Assumptions: I. People do not ask about your tailor if your suit is not good. II. The people want to know the criterion of an excellent suit.
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