Reference for Eruvin 101:11

הני מילי היכא דליכא מידי דדמי ליה אבל היכא דאיכא מידי דדמי ליה מדמי ליה ילפינן:

from the verse: From the wall of the city and outward<span class="x" onmousemove="('comment',' similar in meaning and form to ('without') .');">²⁹</span> a thousand cubits?<span class="x" onmousemove="('comment',' And the permitted distance should accordingly be no more than one thousand cubits.');">³⁰</span> The expression, 'without' is deduced from 'without' but not from 'outward'. What material difference, however, is there between the two expressions?

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