Declension table of ?upasthāvan

Neuter	Singular	Dual	Plural
Nominative	upasthāva	upasthāvnī upasthāvanī	upasthāvāni
Vocative	upasthāvan upasthāva	upasthāvnī upasthāvanī	upasthāvāni
Accusative	upasthāva	upasthāvnī upasthāvanī	upasthāvāni
Instrumental	upasthāvnā	upasthāvabhyām	upasthāvabhiḥ
Dative	upasthāvne	upasthāvabhyām	upasthāvabhyaḥ
Ablative	upasthāvnaḥ	upasthāvabhyām	upasthāvabhyaḥ
Genitive	upasthāvnaḥ	upasthāvnoḥ	upasthāvnām
Locative	upasthāvni upasthāvani	upasthāvnoḥ	upasthāvasu

Compound upasthāva -

Adverb -upasthāva -upasthāvam