Declension table of ?hetuvacana

Neuter	Singular	Dual	Plural
Nominative	hetuvacanam	hetuvacane	hetuvacanāni
Vocative	hetuvacana	hetuvacane	hetuvacanāni
Accusative	hetuvacanam	hetuvacane	hetuvacanāni
Instrumental	hetuvacanena	hetuvacanābhyām	hetuvacanaiḥ
Dative	hetuvacanāya	hetuvacanābhyām	hetuvacanebhyaḥ
Ablative	hetuvacanāt	hetuvacanābhyām	hetuvacanebhyaḥ
Genitive	hetuvacanasya	hetuvacanayoḥ	hetuvacanānām
Locative	hetuvacane	hetuvacanayoḥ	hetuvacaneṣu

Compound hetuvacana -

Adverb -hetuvacanam -hetuvacanāt