चिणो लुक्

Operational rule vidhi

The तिङ् प्रत्यय that follows the चिण् विकरणप्रत्यय undergoes a लुक्.

Word by word (padaccheda)

Left context चिणः pañcamī · ekavacanaSubstitute / term prathamā · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

चिणः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The personal endings are elided after चिण् , the 3rd person singular Passive of Aorist.
As अहारि, अलावि, अकारि, अपाचि ॥ So also अकारितराम्, अहारितमाम्, here the elision of the personal affix त 3.1.60 of the Aorist being considered as asiddha, the affixes तरप् and तमप् are not elided: though if the sutra were to be literally interpreted, every affix after चिण्, ought to be elided. Or the word क्ङिति is understood here; so that कित् and ङित् affixes of चिण् are elided and not every affix.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.