Declension table of ?dvādaśin

Masculine	Singular	Dual	Plural
Nominative	dvādaśī	dvādaśinau	dvādaśinaḥ
Vocative	dvādaśin	dvādaśinau	dvādaśinaḥ
Accusative	dvādaśinam	dvādaśinau	dvādaśinaḥ
Instrumental	dvādaśinā	dvādaśibhyām	dvādaśibhiḥ
Dative	dvādaśine	dvādaśibhyām	dvādaśibhyaḥ
Ablative	dvādaśinaḥ	dvādaśibhyām	dvādaśibhyaḥ
Genitive	dvādaśinaḥ	dvādaśinoḥ	dvādaśinām
Locative	dvādaśini	dvādaśinoḥ	dvādaśiṣu

Compound dvādaśi -

Adverb -dvādaśi