Reference for Eruvin 31:12

סיפא לרב פפא לא קשיא איידי דתנא רישא פרוץ מרובה על העומד תנא סיפא עומד מרובה על הפרוץ

is forbidden. If forked reeds were there and a plait was made above them, [sowing] is permitted even [if the gaps between the reeds] exceeded ten cubits.<span class="x" onmousemove="('comment',' Tosef. Kil. IV; because a gap in the shape of a doorway, even if it is wider than ten cubits, does not impair the validity of a fence.');">¹⁶</span>

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