अनङ् सौ

Operational rule vidhi

The word सखि gets an अनङ्-आदेश when it is followed by सुँ-प्रत्यय of प्रथमा-एकवचन.

Word by word (padaccheda)

Substitute / term अनङ् prathamā · ekavacanaRight context सौ saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

अनङ् सौ

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

Commentary

अनङ् (अन्) is substituted for the इ of सखि before सु of the Nominative 1st-Case singular (but not in the Vocative Case singular).
As सखा, but हे सखे ॥

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