Declension table of ?sastara

Masculine	Singular	Dual	Plural
Nominative	sastaraḥ	sastarau	sastarāḥ
Vocative	sastara	sastarau	sastarāḥ
Accusative	sastaram	sastarau	sastarān
Instrumental	sastareṇa	sastarābhyām	sastaraiḥ sastarebhiḥ
Dative	sastarāya	sastarābhyām	sastarebhyaḥ
Ablative	sastarāt	sastarābhyām	sastarebhyaḥ
Genitive	sastarasya	sastarayoḥ	sastarāṇām
Locative	sastare	sastarayoḥ	sastareṣu

Compound sastara -

Adverb -sastaram -sastarāt