Declension table of ?dvirasana

Masculine	Singular	Dual	Plural
Nominative	dvirasanaḥ	dvirasanau	dvirasanāḥ
Vocative	dvirasana	dvirasanau	dvirasanāḥ
Accusative	dvirasanam	dvirasanau	dvirasanān
Instrumental	dvirasanena	dvirasanābhyām	dvirasanaiḥ dvirasanebhiḥ
Dative	dvirasanāya	dvirasanābhyām	dvirasanebhyaḥ
Ablative	dvirasanāt	dvirasanābhyām	dvirasanebhyaḥ
Genitive	dvirasanasya	dvirasanayoḥ	dvirasanānām
Locative	dvirasane	dvirasanayoḥ	dvirasaneṣu

Compound dvirasana -

Adverb -dvirasanam -dvirasanāt