Commentary for Eruvin 186:8

אין הכי נמי וכי קתני פחות מכאן מערבין אחד ואין מערבין שנים אתחתונה

deals with a case,] for instance, where the upper courtyard had rims<span class="x" onmousemove="('comment',' Rising on the embankment and forming a partition of ten handbreadths high round the upper courtyard.');">²¹</span> [that left a gap]<span class="x" onmousemove="('comment',' In the center of the partition.');">²²</span> not wider than ten cubits.<span class="x" onmousemove="('comment',' And it was in this gap, which may be regarded as a doorway, that the partition on the embankment was only five handbreadths high. The upper courtyard is thus separated from the lower one by both a valid partition and a doorway while the latter is separated from it completely by a valid partition. Hence the ruling that one imposes no restrictions on the other and that two separate erubs must be prepared. A joint 'erub, however, is not allowed on account of the valid partition of the lower one.');">²³</span>

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