Declension table of ?hastidvayasa

Neuter	Singular	Dual	Plural
Nominative	hastidvayasam	hastidvayase	hastidvayasāni
Vocative	hastidvayasa	hastidvayase	hastidvayasāni
Accusative	hastidvayasam	hastidvayase	hastidvayasāni
Instrumental	hastidvayasena	hastidvayasābhyām	hastidvayasaiḥ
Dative	hastidvayasāya	hastidvayasābhyām	hastidvayasebhyaḥ
Ablative	hastidvayasāt	hastidvayasābhyām	hastidvayasebhyaḥ
Genitive	hastidvayasasya	hastidvayasayoḥ	hastidvayasānām
Locative	hastidvayase	hastidvayasayoḥ	hastidvayaseṣu

Compound hastidvayasa -

Adverb -hastidvayasam -hastidvayasāt