Declension table of ?dvādaśin

Neuter	Singular	Dual	Plural
Nominative	dvādaśi	dvādaśinī	dvādaśīni
Vocative	dvādaśin dvādaśi	dvādaśinī	dvādaśīni
Accusative	dvādaśi	dvādaśinī	dvādaśīni
Instrumental	dvādaśinā	dvādaśibhyām	dvādaśibhiḥ
Dative	dvādaśine	dvādaśibhyām	dvādaśibhyaḥ
Ablative	dvādaśinaḥ	dvādaśibhyām	dvādaśibhyaḥ
Genitive	dvādaśinaḥ	dvādaśinoḥ	dvādaśinām
Locative	dvādaśini	dvādaśinoḥ	dvādaśiṣu

Compound dvādaśi -

Adverb -dvādaśi