Midrash for Chullin 99:40
הלכה וכן אמר רבי יוחנן
of one group with the defect in the membranous portion of another group, but we may not compare the defect in the cartilaginous portion with the defect in a membranous portion, nor the defect in the membranous portion with the defect in a cartilaginous portion.
Sifrei Devarim
Abba Channan says in the name of R. Eliezer: The shesuah is a beast in itself; it has two backs and two spines.
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