Declension table of ?yāsa

Masculine	Singular	Dual	Plural
Nominative	yāsaḥ	yāsau	yāsāḥ
Vocative	yāsa	yāsau	yāsāḥ
Accusative	yāsam	yāsau	yāsān
Instrumental	yāsena	yāsābhyām	yāsaiḥ yāsebhiḥ
Dative	yāsāya	yāsābhyām	yāsebhyaḥ
Ablative	yāsāt	yāsābhyām	yāsebhyaḥ
Genitive	yāsasya	yāsayoḥ	yāsānām
Locative	yāse	yāsayoḥ	yāseṣu

Compound yāsa -

Adverb -yāsam -yāsāt