Declension table of ?upasthasad

Neuter	Singular	Dual	Plural
Nominative	upasthasat	upasthasadī	upasthasandi
Vocative	upasthasat	upasthasadī	upasthasandi
Accusative	upasthasat	upasthasadī	upasthasandi
Instrumental	upasthasadā	upasthasadbhyām	upasthasadbhiḥ
Dative	upasthasade	upasthasadbhyām	upasthasadbhyaḥ
Ablative	upasthasadaḥ	upasthasadbhyām	upasthasadbhyaḥ
Genitive	upasthasadaḥ	upasthasadoḥ	upasthasadām
Locative	upasthasadi	upasthasadoḥ	upasthasatsu

Compound upasthasat -

Adverb -upasthasat