Declension table of ?tatastya

Masculine	Singular	Dual	Plural
Nominative	tatastyaḥ	tatastyau	tatastyāḥ
Vocative	tatastya	tatastyau	tatastyāḥ
Accusative	tatastyam	tatastyau	tatastyān
Instrumental	tatastyena	tatastyābhyām	tatastyaiḥ tatastyebhiḥ
Dative	tatastyāya	tatastyābhyām	tatastyebhyaḥ
Ablative	tatastyāt	tatastyābhyām	tatastyebhyaḥ
Genitive	tatastyasya	tatastyayoḥ	tatastyānām
Locative	tatastye	tatastyayoḥ	tatastyeṣu

Compound tatastya -

Adverb -tatastyam -tatastyāt