Declension table of ?uṣasta

Masculine	Singular	Dual	Plural
Nominative	uṣastaḥ	uṣastau	uṣastāḥ
Vocative	uṣasta	uṣastau	uṣastāḥ
Accusative	uṣastam	uṣastau	uṣastān
Instrumental	uṣastena	uṣastābhyām	uṣastaiḥ uṣastebhiḥ
Dative	uṣastāya	uṣastābhyām	uṣastebhyaḥ
Ablative	uṣastāt	uṣastābhyām	uṣastebhyaḥ
Genitive	uṣastasya	uṣastayoḥ	uṣastānām
Locative	uṣaste	uṣastayoḥ	uṣasteṣu

Compound uṣasta -

Adverb -uṣastam -uṣastāt