Declension table of ?tvacasya

Masculine	Singular	Dual	Plural
Nominative	tvacasyaḥ	tvacasyau	tvacasyāḥ
Vocative	tvacasya	tvacasyau	tvacasyāḥ
Accusative	tvacasyam	tvacasyau	tvacasyān
Instrumental	tvacasyena	tvacasyābhyām	tvacasyaiḥ tvacasyebhiḥ
Dative	tvacasyāya	tvacasyābhyām	tvacasyebhyaḥ
Ablative	tvacasyāt	tvacasyābhyām	tvacasyebhyaḥ
Genitive	tvacasyasya	tvacasyayoḥ	tvacasyānām
Locative	tvacasye	tvacasyayoḥ	tvacasyeṣu

Compound tvacasya -

Adverb -tvacasyam -tvacasyāt