Declension table of ?mānāsa

Masculine	Singular	Dual	Plural
Nominative	mānāsaḥ	mānāsau	mānāsāḥ
Vocative	mānāsa	mānāsau	mānāsāḥ
Accusative	mānāsam	mānāsau	mānāsān
Instrumental	mānāsena	mānāsābhyām	mānāsaiḥ mānāsebhiḥ
Dative	mānāsāya	mānāsābhyām	mānāsebhyaḥ
Ablative	mānāsāt	mānāsābhyām	mānāsebhyaḥ
Genitive	mānāsasya	mānāsayoḥ	mānāsānām
Locative	mānāse	mānāsayoḥ	mānāseṣu

Compound mānāsa -

Adverb -mānāsam -mānāsāt