7.4.86
जपजभदहदशभञ्जपशां च
Operational rule vidhi
The augment नुक् (न्) comes after the reduplicates of 1. जप 2. जभ 3. दह 4. दश 5. भञ्ज and 6. पश in the Intensive (with expressed or elided यङ्).
Word by word (padaccheda)
Target जपजभदहदशभञ्जपशाम् ṣaṣṭhī · bahuvacanaIndeclinable च avyaya
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
जपजभदहदशभञ्जपशाम् च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The augment नुक् (न्) comes after the reduplicates of 1. जप 2. जभ 3. दह 4. दश 5. भञ्ज and 6. पश in the Intensive (with expressed or elided यङ्).
Thus जंजप्यते and जंजपीति; जंजभ्यते and जंजभीति, दंदह्यते and दंदहीति; दंदश्यते and दंदशीति ॥ The root is दंश्, but it is exhibited in the sutra as दश, showing that even in यङ् लुक्, the root loses its nasal. Similarly बंभज्यते and बंभजीति, and पंपश्यते and पंपशीति ॥ This last is a sautra root.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.