अन्तर्बहिर्भ्यां च लोम्नः

Operational rule vidhi

The affix अप् comes after a बहुव्रीहि समास ending in लोमन् and preceded by 1. अन्तर and 2. बहिस्.

Word by word (padaccheda)

Left context अन्तर्बहिर्भ्याम् pañcamī · dvivacanaIndeclinable च avyayaLeft context लोम्नः pañcamī · ekavacana

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".

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

Full reading

अन्तर्बहिर्भ्याम् च लोम्नः

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

Commentary

The affix अप् comes after a बहुव्रीहि समास ending in लोमन् and preceded by 1. अन्तर and 2. बहिस्।
Thus अन्तर्गतानि लोमान्यस्य = अन्तर्लोमः प्रावारः 'a cloak having the hairy surface inside'. Similarly बहिर्लोमः पटः ॥

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