Midrash for Chullin 99:38
פלוגתא נינהו
[of cartilaginous rings], but we may not compare the defect in one group with the defect in another group [of rings in the same windpipe].
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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