चरफलोश्च

Operational rule vidhi

The augment नुक् (न्) comes after the reduplicates of चर् and फल् in the Intensive (with expressed or elided यङ्).

Word by word (padaccheda)

Target चरफलोः ṣaṣṭhī · dvivacanaIndeclinable 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

चरफलोः 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 चर् and फल् in the Intensive (with expressed or elided यङ्).
Thus चंचूर्यते and चंचूरीति (the lengthening of ऊ is by 8.2.77) पंफुल्यते and पंफुलीति ॥ See the following sutra.

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