7.1.52 आमि सर्वनाम्नः सुट्

Word by word (padaccheda)

Right context आमि saptamī · ekavacanaLeft context सर्वनाम्नः pañcamī · ekavacanaSubstitute / term सुट् prathamā · ekavacana

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").
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

आमि सर्वनाम्नः सुट्

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

Commentary

After a Pronominal अङ्ग (stem) ending in a अ or आ the affix आम् of the Genitive 6th-Case plural gets the augment स् at the beginning.
The word आत् of the last sutra is understood here. Thus सर्वेषाम्, विश्वेषाम्, येषाम्, तेषाम्, सर्वासाम्, यासाम्, तासाम् ॥ But भवताम् of भवत् ॥ The आम् of the sutra is the Genitive Plural ending आम्, and not the आम् of the Locative Singular ordained by 7.3.116; for that आम् takes the augments याट्, आट् or स्याट् 7.3.112 — 7.3.114, while the present आम् takes सुट् or नुट् ॥ Nor the आम् of the Perfect Tense 3.1.35 &c), because that refers to verb and Sarvanama nor the आम् of 5.4.11, for the same reason. The word आमि is exhibited in the sutra in the locative case, for the sake of the subsequent sutra 7.1.53. For the purposes of the present sutra, it should be construed, as if it was in the Genitive case (आमः सर्वनाम्नः सुट्), because सर्वनाम्नः being in the Ablative case, the augment सुट् will be added at the beginning of the affix following it, on the maxim तस्मादित्युत्तरस्य ॥

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