Quoting%20commentary for Niddah 19:13

רבי היא ובעונות סבר לה כר"א ומי סבר לה

but as regards one discovered between her second and third observation, Hezekiah ruled: It is unclean, while R. Johanan ruled: It is clean. 'Hezekiah ruled: It is unclean', since, when she observed [a discharge for the third time] she becomes unclean [retrospectively],<span class="x" onmousemove="('comment',' Which shows that her presumptive menstruation begins after her second discharge. ');">¹²</span>

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