Declension table of ?pratidvandva

Neuter	Singular	Dual	Plural
Nominative	pratidvandvam	pratidvandve	pratidvandvāni
Vocative	pratidvandva	pratidvandve	pratidvandvāni
Accusative	pratidvandvam	pratidvandve	pratidvandvāni
Instrumental	pratidvandvena	pratidvandvābhyām	pratidvandvaiḥ
Dative	pratidvandvāya	pratidvandvābhyām	pratidvandvebhyaḥ
Ablative	pratidvandvāt	pratidvandvābhyām	pratidvandvebhyaḥ
Genitive	pratidvandvasya	pratidvandvayoḥ	pratidvandvānām
Locative	pratidvandve	pratidvandvayoḥ	pratidvandveṣu

Compound pratidvandva -

Adverb -pratidvandvam -pratidvandvāt