Reference for Chullin 231:3

חדא מתלת אי הדר דינא ואתי במה הצד פרכינן כל דהו ואי לא קולא וחומרא פרכינן כל דהו לא פרכינן

An argument inferring one case from three cases, the argument from the three cases going round and round, so that the inference is made from the features common to all, can be refuted by any peculiarity whatsoever; but if it is not so,<span class="x" onmousemove="('comment',' I.e., the inference is not drawn from the common features, but by placing one case against the other.');">¹</span>

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