Reference for Eruvin 38:5

בבור שתים עשרה דכ"ע לא פליגי דבעינן פשוטין

In respect of a cistern that is twelve [cubits wide]<span class="x" onmousemove="('comment',' So that each side of the enclosure is sixteen cubits wide: Twelve cubits (the width of the cistern) plus twice two (as supra n. 3) .');">¹¹</span> no one disputes the ruling<span class="x" onmousemove="('comment',' Even R. Judah admits.');">¹²</span> that single boards also are required.<span class="x" onmousemove="('comment',' Because the distances between the corner-pieces are (16 - 2 =) fourteen cubits and represent gaps which even R. Judah does not allow.');">¹³</span>

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