Declension table of ?copana

Neuter	Singular	Dual	Plural
Nominative	copanam	copane	copanāni
Vocative	copana	copane	copanāni
Accusative	copanam	copane	copanāni
Instrumental	copanena	copanābhyām	copanaiḥ
Dative	copanāya	copanābhyām	copanebhyaḥ
Ablative	copanāt	copanābhyām	copanebhyaḥ
Genitive	copanasya	copanayoḥ	copanānām
Locative	copane	copanayoḥ	copaneṣu

Compound copana -

Adverb -copanam -copanāt