Reference for Niddah 59:22

ש"מ תלת ש"מ

would suffice?<span class="x" onmousemove="('comment',' To make up the number 80: 3 + 8 1/2 weeks = 11 1/2 weeks = 11 X 7 + 3 = 80 days. ');">²¹</span>

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