दयायासश्च

Operational rule vidhi

After the words दय 'to give', 'to go' and 'to protect', अय 'to go' and आस 'to sit', there is the affix आम् when लिट् (Perfect Tense) follows.

Word by word (padaccheda)

Left context दयायासः pañcamī · ekavacanaIndeclinable च avyaya

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

दयायासः च

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

Commentary

After the words दय 'to give', 'to go' and 'to protect', अय 'to go' and आस 'to sit', there is the affix आम् when लिट् (Perfect Tense) follows.
Thus दयाञ्चके 'he gave'; पलायाञ्चक्रे 'he ran away'; आसाञ्चक्रे 'he sat'.

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