Reference for Eruvin 5:18

אי קלשת הויא לה חמתה מרובה מצילתה

cedar poles, is not his reason because their length is considerable?<span class="x" onmousemove="('comment',' In consequence of which they would be easily observed even at a considerable height.');">⁴⁰</span> But [if so, it may be objected]: Is not the extent [of the roof] of a sukkah considerable<span class="x" onmousemove="('comment',' Cf. supra n. 2.');">⁴¹</span> and the Rabbis nevertheless ruled that it is not [valid]!<span class="x" onmousemove="('comment',' If it is more than twenty cubits high.');">⁴²</span>

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