Reference for Eruvin 186:3

אמר (רב) מודה רב חסדא בתחתונה הואיל ורואה פני עשרה אי הכי תחתונה תערב שנים ולא תערב אחד עליונה לא תערב לא אחד ולא שנים

but not one.<span class="x" onmousemove="('comment',' For the two jointly,');">⁶</span> If i was lower, only a single 'erub<span class="x" onmousemove="('comment',' For the two jointly,');">⁶</span> may be prepared but not two 'erubs!<span class="x" onmousemove="('comment',' Cf. supra n. 12; which shows that an embankment and a partition are reckoned together as one unit of heights. How then could R. Hisda maintain that they are not combined?');">⁸</span>

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