After a Pronominal aṅga (stem) ending in a a or ā the affix ām of the Genitive 6th-Case plural gets the augment s 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 (III. I. 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 (VII. I. 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 ॥,