4.1.100
हरितादिभ्योऽञः
Operational rule vidhi
The affix फक् comes after the words हरित etc. when they end in the affix अञ् -- अनृष्यानन्तर्ये बिदादिभ्योऽञ् (4.1.104)
Word by word (padaccheda)
Left context हरित- आदिभ्यः pañcamī · bahuvacanaLeft context अञः 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.
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Full reading
हरित-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix फक् comes after the words हरित etc. when they end in the affix अञ् -- अनृष्यानन्तर्ये बिदादिभ्योऽञ् 4.1.104
The words हरित &c, form a subdivision of बिद class, which class by 4.1.104 takes the affix अञ् in forming Gotra words. Thus the Gotra descendant of हरित will be हारित (हरित + अञ्). The son of हारित will be formed by this sutra and not by 4.1.95. Thus हारित + फक् = हारितायनः "the son of Harita or the great-grandson of Harita". In fact, the force of the affix फक् of this Sutra is that of a Yuvan affix, though it is taught in the chapter of Gotra affixes; because according to the general rule 4.1.98 one Gotra affix can be only added to a word, and the word हारित that being already formed by a Gotra affix अञ् will not take again another Gotra affix फक् ॥ Therefore, फक् as is here a Yuvan-affix.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.