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UrNAyA yus ऊर्णाया युस् ONPANINI 52123

/yus comes UrNA ऊर्णा "wool" (in the sense of /matup, in the veda).

The /sit in "yus" makes UrNA ऊर्णा into a /pada by sitica. This makes it not be a /bha, so varcaskevask... no longer applies, and we get UrNAyu- ऊर्णायुॱ "ewe, ram", not *UrNyu- ऊर्ण्युॱ.

Wait, what happened to yuvoranAkau?

Well, this sUtra shows by /jJApaka that...

Okay, okay, got it.