“Prá”, “párā”, “ní”, “sám”, “ā”́, “dúr”, “nír”, “áva”, “ádhi”, “pári”, “ví”, “áti”, “ápi”, “sú”, “úd”, “ápa”, “sú”, “úd”, “ápa”, “abhí”, “úpa”, “ánu”, and “práti” are the twenty [“upasargas”]. Of these, the monosyllabic ones have the high-pitch accent. Others have their first syllable with the high-pitch accent, [eccept for] “abhí” [which has its] final [syllable with the high-pitch accent]. In conjunction with verbs, these items are called “upasarga”, as well as “gati”. (pp. 491-492)
- Deshpande (1997), Pag.

A pre-verb is compounded with an accented verb. When there is more than one pre-verb [preceding the verb], they are [all] compounded even with an unaccented verb. (pp. 498-499)
- Deshpande (1997), Pag.