पाण्डुकम्बलादिनिः

Operational rule vidhi

The word पाण्डुकम्बल gets the प्रत्यय 'इनि' in the meaning of 'परिवृतो रथः'.

Word by word (padaccheda)

Left context पाण्डुकम्बलात् pañcamī · ekavacanaSubstitute / term इ ः 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.

Dotted words are technical terms. Hover or tap one to see its card.

Pink letters are it-markers (anubandhas), tags dropped by 1.3.9. Hover or tap one for the rule that marks it, or try the it-letter finder.

Full reading

पाण्डुकम्बलात् इनिः

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

Commentary

The affix इनि comes after the word पाण्डुकम्बल etc. being in the Instrumental -3rd case in construction in the sense of 'surrounded' the thing so surrounded being 'a chariot'.
This debars अण् ॥ Thus पाण्डुकम्बली रथः 'a carriage covered with a white woolen blanket'. The word पाण्डुकम्बल means the housing of a royal elephant. The form पाण्डुकम्बलिन् would have been obtained by the affix इनि of 5.2.115, the present sutra is made in order to debar the affix अण् ॥

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