Reference for Niddah 126:7

הרי אמרו לימים שנים לוסתות אחת למה שלא מנו חכמים שלשה

But [I do not know] what the expression, 'for settled periods that are determined by conditions which the Sages did not enumerate intended to include? — R. Joseph replied: To include a woman who feels a heaviness in the head,<span class="x" onmousemove="('comment',' Lit., 'whose head is heavy upon her'. ');">³</span>

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