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Perishah to Tur Orach Chaim 267 (answering a slightly different question) explains that there are in fact mazikim on shabbat, which would be consistent with the explanation you give for the recital of me'ein sheva. He goes on to explain that when we say shabbat provides protection (and therefore we don't say shomer amo yisrael la'ad on shabbat) this means ...


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