Declension table of ?dvādaśaka

Neuter	Singular	Dual	Plural
Nominative	dvādaśakam	dvādaśake	dvādaśakāni
Vocative	dvādaśaka	dvādaśake	dvādaśakāni
Accusative	dvādaśakam	dvādaśake	dvādaśakāni
Instrumental	dvādaśakena	dvādaśakābhyām	dvādaśakaiḥ
Dative	dvādaśakāya	dvādaśakābhyām	dvādaśakebhyaḥ
Ablative	dvādaśakāt	dvādaśakābhyām	dvādaśakebhyaḥ
Genitive	dvādaśakasya	dvādaśakayoḥ	dvādaśakānām
Locative	dvādaśake	dvādaśakayoḥ	dvādaśakeṣu

Compound dvādaśaka -

Adverb -dvādaśakam -dvādaśakāt