According to Beis Shamai, when she sees dam on the twelfth day she is accorded a tumah miderabanan. This is done in order to avoid any possible confusion, since had this occurred on any of the yemei zeeva she certainly would have been rendered tamei min hatorah. Beis Hillel however maintain that she is completely tahor – it is only considered to be inappropriate conduct, but there is no rabbinic tumah applied. How do we understand the reason behind Beis Hillel’s opinion; why is this case different than any of the other cases where she is accorded a tumah miderabanan when there is any room for confusion, as Beis Hillel themselves have stated earlier in the Mishna regarding the night following the eleventh day?
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