Commentary for Eruvin 109:9

לא צריכא משתי רוחות מהו דתימא מרוח אחת אמרינן משתי רוחות לא אמרינן קא משמע לן

If it is square shaped no corners are added to it'. Is not this obvious? - This was only required in a case where it is square shaped but the sides of the square are not parallel with the four directions of the world. As it might have been presumed that it should be deemed to be enclosed in an imaginary square whose sides are parallel with the four directions of the world, we were informed [that this is not permitted].' If one house projected like a turret, or if two houses projected like two turrets'.

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