Declension table of ?upasthāvan

Masculine	Singular	Dual	Plural
Nominative	upasthāvā	upasthāvānau	upasthāvānaḥ
Vocative	upasthāvan	upasthāvānau	upasthāvānaḥ
Accusative	upasthāvānam	upasthāvānau	upasthāvnaḥ
Instrumental	upasthāvnā	upasthāvabhyām	upasthāvabhiḥ
Dative	upasthāvne	upasthāvabhyām	upasthāvabhyaḥ
Ablative	upasthāvnaḥ	upasthāvabhyām	upasthāvabhyaḥ
Genitive	upasthāvnaḥ	upasthāvnoḥ	upasthāvnām
Locative	upasthāvni upasthāvani	upasthāvnoḥ	upasthāvasu

Compound upasthāva -

Adverb -upasthāvam