Yevamot 55: Another NSFW
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The punishment for "all the prohibited sexual relationships" is stated as karet, and then the punishment for prohibition of one's sister is separate. Why? What if they were all violated "be-he'elem echad," in one time period of forgetting. Also, how do we know that a woman (not yibum) would be betrothed via sexual intercourse? The answer relies on the Torah's use of the same term in disparate cases.