Reference for Bava Batra 44:8

והא אנן תנן ארבע אמות לא קשיא כאן מרוח אחת כאן משתי רוחות

How far [must such a wall be kept away so as not to take away the other's light]?<span class="x" onmousemove="('comment',' This question has reference to the Baraitha just mentioned, where no exact measurements are mentioned. ');">⁷</span>

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