Declension table of ?dvivrata

Neuter	Singular	Dual	Plural
Nominative	dvivratam	dvivrate	dvivratāni
Vocative	dvivrata	dvivrate	dvivratāni
Accusative	dvivratam	dvivrate	dvivratāni
Instrumental	dvivratena	dvivratābhyām	dvivrataiḥ
Dative	dvivratāya	dvivratābhyām	dvivratebhyaḥ
Ablative	dvivratāt	dvivratābhyām	dvivratebhyaḥ
Genitive	dvivratasya	dvivratayoḥ	dvivratānām
Locative	dvivrate	dvivratayoḥ	dvivrateṣu

Compound dvivrata -

Adverb -dvivratam -dvivratāt