अयङ् यि क्ङिति

Operational rule vidhi

Before an affix beginning with a य् and having an indicatory क् or ङ् there is substituted अय् for the ई of शी.

Word by word (padaccheda)

Substitute / term अयङ् prathamā · ekavacanaRight context यि saptamī · ekavacanaRight context क्ङिति saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

अयङ् यि क्ङिति

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

Commentary

Before an affix beginning with a य् and having an indicatory क् or ङ् there is substituted अय् for the ई of शी।
As शय्यते with यक्, शाशय्यते with यङ्, प्रशय्य and उपशय्य with ल्यप् which being the substitute of क्त्वा in कित् ॥ But शिश्ये where the affix is ए, and शेयम् where the affix is यत् (neither कित् or ङित्) ॥

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