Reference for Chullin 89:14

אמר ליה הרי אמרו

R'Papa said: And in order to remember this [test] think of a sieve.<span class="x" onmousemove="('comment',' Which is a cavity covered over by a network of small holes; here too the portion perforated must be placed over the cavity of the windpipe.');">¹⁰</span>

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