अभ्यासाच्च

Operational rule vidhi

A guttural is substituted for the ह् in हन् 'to kill' after reduplication also.

Word by word (padaccheda)

Left context 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

च

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

Commentary

A guttural is substituted for the ह् in हन् 'to kill' after reduplication also.
As जिघांसति, जङ्घन्यते, अहं जघान ॥ The rule applies when such an affix follows which causes the reduplication of the stem (anga) हन्, therefore not here हननीयितुमिच्छाति = जिहननीयिषति ॥

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