Halakhah for Eruvin 10:9
רב אשי אמר אפילו תימא במבוי שמונה נמי לא צריך לחי מה נפשך אי עומד נפיש ניתר בעומד מרובה על הפרוץ ואי פרוץ נפיש נידון משום לחי
[was also allowed in it]?<span class="x" onmousemove="('comment',' Of course it is; the freedom of movement in the courtyard is not affected by such a gap.');"><sup>25</sup></span> Then how can one apply<span class="x" onmousemove="('comment',' Lit., 'wilt thou say'.');"><sup>26</sup></span> [the same ruling] to an alley where only a gap of four cubits<span class="x" onmousemove="('comment',' Lit., 'whose breach by four'.');"><sup>27</sup></span> [was allowed]?<span class="x" onmousemove="('comment',' As in the case of an alley, the law was restricted in respect of the size of a gap so it might also have been restricted as regards permissibility of movement where the built portion is larger than the gap. How then (cf. supra note 14) could a law relating to an alley be inferred from one relating to a courtyard?');"><sup>28</sup></span>