Reference for Bekhorot 79:37

<big><strong>גמ׳</strong></big> א"ר הונא

is meant only when [the animal] has one foot too few or one too many in front;<span class="x" onmousemove="('comment',' E.g., if in the one case it has three fore-feet as well as its two hind-feet, and in the other, it has the two hind-feet and one fore-foot. The reason is that trefah does not apply to the fore-foot.');">¹⁸</span>

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