Reference for Eruvin 110:6

אמר אביי כוותיה דרבא בריה דרבה בר רב הונא מסתברא דאי בעי הדר אתי דרך בתים:

where the space of one karpaf would not be too cramped.<span class="x" onmousemove="('comment',' Since originally, when the area of the gap was occupied by houses, the inhabitants in either section did not have the use of even one karpaf.');">¹⁰</span> Hence both rulings were required.

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