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When do conflicting chazakos combine to create tartei reisa? The Kesef Mishneh suggests they only combine when dealing with tools or instruments that lack inherent din, not when resolving the status of entities themselves. This yesod explains why certain cases allow tartei reisa while our sugya may not.
The shiur examines a fundamental question in the mechanics of chazakos: when can conflicting presumptions combine to create tartei reisa (two reasons supporting the same conclusion)? The discussion centers on Kesubos 9a and the case of a woman whose virginity status affects her permissibility to marry a kohen. The Gemara (גמרא) presents a safek: was this woman's loss of virginity before or after her marriage? Chezkas haguf (presumption about bodily state) suggests it happened later, while harei beulah lefanecha (the fact of her current non-virgin state) combined with chezkas heter lakehuna (presumption of permissibility to kohen) might support that it happened earlier through tartei reisa.
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Kesubos 9a
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