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319. Polysyllabic stems ending in accented short vowels

Of polysyllabic stems ending in accented short vowels, the final of the stem retains the accent if it retains its syllabic identity: thus, datténa and dattā́ya fromdattá; agnínā and agnáye from agní; and also dattébhyas, agníbhyas, and so on. Otherwise, the accent is on the ending: and that, whether the final and the ending are combined into one, as in dattāís, dhenāú, agnī́n, dhenū́s, and so on; or whether the final is changed into a semivowel before the ending: thus, dhenvā́, pitrā́,jāmyós, bāhvós, etc.

a. But ām of the gen. pl. from stems in í and ú and ṛ́ may, and in the older language always does, take the accent, though separated by n from the stem: thus, agnīnā́m,dhenūnā́m, pitṝṇā́m. In RV., even derivative ī-stems show usually the same shift: thus, bahvīnā́m. Of stems in á, only numerals (483 a) follow this rule: thus, saptānā́m,daçānā́m.