Reference for Bekhorot 80:20

או שאין בה שלש חוליות וכו':

Said R'Papa: Do not say that it must be round as well as [very] thin;<span class="x" onmousemove="('comment',' That it is required to be like that of a swine in every way, in order to be a disqualifying blemish.');">¹¹</span>

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