Midrash for Chullin 99:35
הא אין הלכה אמרי
with the small and the large with the large, but not the large with the small nor the small with the large.
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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