Declension table of ?sarasya

Masculine	Singular	Dual	Plural
Nominative	sarasyaḥ	sarasyau	sarasyāḥ
Vocative	sarasya	sarasyau	sarasyāḥ
Accusative	sarasyam	sarasyau	sarasyān
Instrumental	sarasyena	sarasyābhyām	sarasyaiḥ sarasyebhiḥ
Dative	sarasyāya	sarasyābhyām	sarasyebhyaḥ
Ablative	sarasyāt	sarasyābhyām	sarasyebhyaḥ
Genitive	sarasyasya	sarasyayoḥ	sarasyānām
Locative	sarasye	sarasyayoḥ	sarasyeṣu

Compound sarasya -

Adverb -sarasyam -sarasyāt