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iTa:: ITi इट‌ ईटि ONPANINI 82028

(/iT + /sic) disappears before /IT.

This augment /IT appears before /t''' /s''' by astisicopRkte. So instead of getting iSIs इषीस् iSIt इषीत् as would be expected, we get just Is ईस् It ईत्, as in —

alU अलू + /iT + /sic + /t''' → !**alAvIt अलावीत् "he reaped"

alU अलू + /iT + /sic + /t''' → !**alAvIs अलावीस् "you' reaped"

muS मुष् + /luG /tip → !**amoSIt अमोषीत्

kuS कुष् + /luG /tip → !**akoSIt अकोषीत्

Why "after /iT"?

The s स् stays after /iT-less /sic —

**akArSIt अकार्षीत्

Why "before /IT"?

The s स् stays before /IT-less endings like /ma''' —

alU अलू + /iT + /sic + /ma''' → !**alAvISma अलावीष्म "we reaped"

Wait, how come we still have /vRddhi in **alAvIt अलावीत् by !! if the /sic disappeared?

Oops. My fault! I translated the sUtra badly. The original does not say that iS इष् (/iT + /sic) disappears or is not added. Instead, it says that /iSic loses its s स् —

alU अलू + (/iT + /sic) + It ईत्
→ alU अलू + i इ + It ईत्

As this i इ is still a /sic, it still causes /vRddhi of alU अलू. After that, it merges with the I ई —

alU अलू + i इ + It ईत्
→ alau अलौ + i इ + It ईत् by sicivRddhiHp...
→ alAvi अलावि + It ईत् by ecoyavAyAvaH
→ alAv अलाव् + It ईत् by akassavarN...
→ **alAvIt अलावीत् "he reaped"