Declension table of ?hāpana

Neuter	Singular	Dual	Plural
Nominative	hāpanam	hāpane	hāpanāni
Vocative	hāpana	hāpane	hāpanāni
Accusative	hāpanam	hāpane	hāpanāni
Instrumental	hāpanena	hāpanābhyām	hāpanaiḥ
Dative	hāpanāya	hāpanābhyām	hāpanebhyaḥ
Ablative	hāpanāt	hāpanābhyām	hāpanebhyaḥ
Genitive	hāpanasya	hāpanayoḥ	hāpanānām
Locative	hāpane	hāpanayoḥ	hāpaneṣu

Compound hāpana -

Adverb -hāpanam -hāpanāt