Declension table of ?upasantāna

Masculine	Singular	Dual	Plural
Nominative	upasantānaḥ	upasantānau	upasantānāḥ
Vocative	upasantāna	upasantānau	upasantānāḥ
Accusative	upasantānam	upasantānau	upasantānān
Instrumental	upasantānena	upasantānābhyām	upasantānaiḥ upasantānebhiḥ
Dative	upasantānāya	upasantānābhyām	upasantānebhyaḥ
Ablative	upasantānāt	upasantānābhyām	upasantānebhyaḥ
Genitive	upasantānasya	upasantānayoḥ	upasantānānām
Locative	upasantāne	upasantānayoḥ	upasantāneṣu

Compound upasantāna -

Adverb -upasantānam -upasantānāt