I learnt that some people don't open bottles on shabbos because it breaks the perforated seal...what are the details of this halacha? Is it allowed or not? Because I've noticed that some people open bottles while others do not. Also, if the opinion is that we shouldn't open bottles, what if one needs to open the grape juice for kiddush, does the fact that its needed for the mitzvah make it allowed?
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readings - Appending 内 to a company name is read ない or うち?
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