Reference for Chullin 89:7

ה"נ כיון דשיעוריה כאיסר לכאיסר מצטרפין

Rabbah B'Bar Hana said in the name of R'Joshua B'Levi: If a strip [of the windpipe] was removed its space<span class="x" onmousemove="('comment',' I.e., its area.');">⁶</span>

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