Yevamot 19: With or Without Consent: Ma'amar
The kind of case we've been dealing with, but with ma'amar, not full yibum - with an entrance to probe R. Shimon's opinion further. Also, more on ma'amar - including the case of ma'amar when she doesn't know about it (does that even work? It's a machloket).
The skinny
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