Declension table of ?dvirasana

Neuter	Singular	Dual	Plural
Nominative	dvirasanam	dvirasane	dvirasanāni
Vocative	dvirasana	dvirasane	dvirasanāni
Accusative	dvirasanam	dvirasane	dvirasanāni
Instrumental	dvirasanena	dvirasanābhyām	dvirasanaiḥ
Dative	dvirasanāya	dvirasanābhyām	dvirasanebhyaḥ
Ablative	dvirasanāt	dvirasanābhyām	dvirasanebhyaḥ
Genitive	dvirasanasya	dvirasanayoḥ	dvirasanānām
Locative	dvirasane	dvirasanayoḥ	dvirasaneṣu

Compound dvirasana -

Adverb -dvirasanam -dvirasanāt