अन्तरं बहिर्योगोपसंव्यानयोः

The word अन्तर always being a सर्वनाम , when meaning 'outer' or 'lower garment', is optionally so before the affix जस्।
The word अन्तर when it means बहिर्योग, viz., 'outer' is always sarvanama, so also, when it means उपसंव्यान or 'a lower garment.' Thus, अन्तरे गृहाः or अन्तरा गृहाः 'outer houses, the residence of Chandal, and other low castes.' So अन्तरे or अन्तराः शाटकाः "the inner garments, such as petticoats worn under the upper garments." The word अन्तर when used in the above sense is always sarvanama, but in the nominative plural, it is optionally so. But, when it is not used in the above senses, it is never a sarvanama, e. g., ग्रामयोरंतरे वसति 'he lives between the two villages,' where the regular locative is अन्तरे. With this sutra ends the section on sarvanamas, which began with sutra 1.1.26.

Vart:- The word अन्तर when qualifying the word पुरि 'a city,' is not to be treated as a sarvanama, and is, therefore, declined like ordinary nouns. As, अन्तरायां पुरि वसति 'he lives out of the city.'

Vart:- The words formed by the affix तीय such as, द्वितीय and तृतीय, are optionally declined as sarvanama before the case-affixes having an indicatory ङ (ङित्), which are the singular terminations of dative, ablative, genitive and locative, as, द्वितीयस्मै or द्वितीयाय, तृतीयाय or तृतीयस्मै.