While looking to establish which days would be included in the definition of ‘yemei zeevah’ the Gemara uses a correlation between the day being fit for sefira and therefore also fit for zeevah, what is the connection between these two things?
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Apparently the concept of a ’clean day’ denotes a day in which dam zeevah is absent. This implies that there is certainly a potential for dam zeevah on that day, hence it obviously is considered as one of the yemei zeevah.