Declension table of dvayasa

Neuter	Singular	Dual	Plural
Nominative	dvayasam	dvayase	dvayasāni
Vocative	dvayasa	dvayase	dvayasāni
Accusative	dvayasam	dvayase	dvayasāni
Instrumental	dvayasena	dvayasābhyām	dvayasaiḥ
Dative	dvayasāya	dvayasābhyām	dvayasebhyaḥ
Ablative	dvayasāt	dvayasābhyām	dvayasebhyaḥ
Genitive	dvayasasya	dvayasayoḥ	dvayasānām
Locative	dvayase	dvayasayoḥ	dvayaseṣu

Compound dvayasa -

Adverb -dvayasam -dvayasāt