Declension table of ?hāyamāna

Masculine	Singular	Dual	Plural
Nominative	hāyamānaḥ	hāyamānau	hāyamānāḥ
Vocative	hāyamāna	hāyamānau	hāyamānāḥ
Accusative	hāyamānam	hāyamānau	hāyamānān
Instrumental	hāyamānena	hāyamānābhyām	hāyamānaiḥ hāyamānebhiḥ
Dative	hāyamānāya	hāyamānābhyām	hāyamānebhyaḥ
Ablative	hāyamānāt	hāyamānābhyām	hāyamānebhyaḥ
Genitive	hāyamānasya	hāyamānayoḥ	hāyamānānām
Locative	hāyamāne	hāyamānayoḥ	hāyamāneṣu

Compound hāyamāna -

Adverb -hāyamānam -hāyamānāt