Declension table of ?prathamavaṣaṭkāra

Masculine	Singular	Dual	Plural
Nominative	prathamavaṣaṭkāraḥ	prathamavaṣaṭkārau	prathamavaṣaṭkārāḥ
Vocative	prathamavaṣaṭkāra	prathamavaṣaṭkārau	prathamavaṣaṭkārāḥ
Accusative	prathamavaṣaṭkāram	prathamavaṣaṭkārau	prathamavaṣaṭkārān
Instrumental	prathamavaṣaṭkāreṇa	prathamavaṣaṭkārābhyām	prathamavaṣaṭkāraiḥ prathamavaṣaṭkārebhiḥ
Dative	prathamavaṣaṭkārāya	prathamavaṣaṭkārābhyām	prathamavaṣaṭkārebhyaḥ
Ablative	prathamavaṣaṭkārāt	prathamavaṣaṭkārābhyām	prathamavaṣaṭkārebhyaḥ
Genitive	prathamavaṣaṭkārasya	prathamavaṣaṭkārayoḥ	prathamavaṣaṭkārāṇām
Locative	prathamavaṣaṭkāre	prathamavaṣaṭkārayoḥ	prathamavaṣaṭkāreṣu

Compound prathamavaṣaṭkāra -

Adverb -prathamavaṣaṭkāram -prathamavaṣaṭkārāt