Declension table of ?tastakvas

Masculine	Singular	Dual	Plural
Nominative	tastakvān	tastakvāṃsau	tastakvāṃsaḥ
Vocative	tastakvan	tastakvāṃsau	tastakvāṃsaḥ
Accusative	tastakvāṃsam	tastakvāṃsau	tastakuṣaḥ
Instrumental	tastakuṣā	tastakvadbhyām	tastakvadbhiḥ
Dative	tastakuṣe	tastakvadbhyām	tastakvadbhyaḥ
Ablative	tastakuṣaḥ	tastakvadbhyām	tastakvadbhyaḥ
Genitive	tastakuṣaḥ	tastakuṣoḥ	tastakuṣām
Locative	tastakuṣi	tastakuṣoḥ	tastakvatsu

Compound tastakvat -

Adverb -tastakvas