अर्तिलूधूसूखनसहचर इत्रः

Operational rule vidhi

The affix इत्र comes after the verbs 1. ऋ 'to go' 2. लू 'to cut' 3. धू 'to shake' 4. सू 'to bring forth' 5. खन् 'to dig' 6. सह् 'to bear' 7. चर् 'to go' , with the sense of instrument.

Word by word (padaccheda)

Left context अर्ति- लू- धू- सू- खन- सह- चरः pañcamī · ekavacanaSubstitute / term इत्रः 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

अर्ति-लू-धू-सू-खन-सह-चरः इत्रः

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

Commentary

The affix इत्र comes after the verbs 1. ऋ 'to go' 2. लू 'to cut' 3. धू 'to shake' 4. सू 'to bring forth' 5. खन् 'to dig' 6. सह् 'to bear' 7. चर् 'to go' , with the sense of instrument.
Thus, अरित्रं 'a rudder'; लवित्रं 'a sickle'; धवित्रं 'a fan'; सवित्रं 'cause of production'; खनित्रं 'a spade'; सहित्रं 'patience'; चरित्रं 'an instituted observance or a narrative'.

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