Halakhah for Eruvin 10:1

פחות מארבע אמות נידון משום לחי ואין צריך לחי אחר להתירו ד' אמות נידון משום מבוי וצריך לחי אחר להתירו

is less than four cubits [in width] it may be regarded as a side-post<span class="x" onmousemove="('comment',' Even if originally it was put there for some other purpose.');">¹</span> and no other post is required to effect the ritual fitness of the alley, [but if it is] four cubits [wide] it is deemed to be [a part of the structure o alley, and<span class="x" onmousemove="('comment',' Unless that projection was especially constructed to serve as a side-post to the entrance.');">²</span> another post is required to effect its ritual fitness'.<span class="x" onmousemove="('comment',' v. supra 5a for notes.');">³</span> Where, however, does one put up that '[other] post'?

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