Declension table of ?pratidvandva

Masculine	Singular	Dual	Plural
Nominative	pratidvandvaḥ	pratidvandvau	pratidvandvāḥ
Vocative	pratidvandva	pratidvandvau	pratidvandvāḥ
Accusative	pratidvandvam	pratidvandvau	pratidvandvān
Instrumental	pratidvandvena	pratidvandvābhyām	pratidvandvaiḥ pratidvandvebhiḥ
Dative	pratidvandvāya	pratidvandvābhyām	pratidvandvebhyaḥ
Ablative	pratidvandvāt	pratidvandvābhyām	pratidvandvebhyaḥ
Genitive	pratidvandvasya	pratidvandvayoḥ	pratidvandvānām
Locative	pratidvandve	pratidvandvayoḥ	pratidvandveṣu

Compound pratidvandva -

Adverb -pratidvandvam -pratidvandvāt