Reference for Berakhot 105:21

ואי בעית אימא הא והא דאיכא אדם חשוב ולא קשיא הא דאיכא חזנא הא דליכא חזנא

And if you want you may say: That both refer to a case where an important person is present, and there is still no difficulty One refers to a case where the synagogue attendant is there, and the other where the he is not there. And if you want you can say:

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