Reference for Arakhin 15:12

<big><strong>מתני׳</strong></big> באין פתח בטועה פחות משבעה ולא יתר על י"ז:

[If she says,] 'I saw uncleanness for four days', her re-count commences after sixteen days;<span class="x" onmousemove="('comment',' If all the four days were either yeme niddah or yeme zibah, the new re-commencement could have started before seventeen days. If they were yeme zibah, the new period of niddah would start after seven days. If the days of the flow fell in the niddah period, the new reckoning could start after fourteen days, viz., the remaining three days of the niddah period and the eleven of the zibah period. In this case one cannot posit the possibility of the first three days of the four days' flow having been the last days of the zibah period, followed by the fourth day as the first of the new niddah period, for, as explained above, the niddah period does not follow upon a three-day flow in the zibah period, before seven completely free days have passed. But it is possible that the first two of the four-day flow were the last days of the zibah period, whereupon only the third day signified the commencement of the zibah period, so that five more days of the niddah and eleven days of the zibah period are required before her re-commencement of her new niddah period may be definitely assumed.');">⁷</span>

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