In the chandas (Vedas) after the words śrī and grāmaṇī the Genitive 6th-Case plural ām gets the augment n,
As श्रीणामुदारो धरुणो रयीणाम्, अन्यत्र सूतग्रामणीनाम् ॥ This sutra could be well dispensed with: by 1.4.5. श्री is optionally a Nadi in the Genitive plural. We make the option of that sutra a vyavasthita-vibhasha, by saying श्री is always Nadi in the Veda, and optionally every where else. As regards सूतग्रामणीनाम्, we have सूतश्च ग्रामणीश्च = सूतग्रामणि, the Genitive Plural of which by 7.1.54 will be सूतग्रामणीनाम् ॥
The necessity of this sutra will, however, arise if the compound be सूताश्च ते ग्रामण्यश्च सूतग्रामण्यः ॥,