Declension table of ?sastavat

Masculine	Singular	Dual	Plural
Nominative	sastavān	sastavantau	sastavantaḥ
Vocative	sastavan	sastavantau	sastavantaḥ
Accusative	sastavantam	sastavantau	sastavataḥ
Instrumental	sastavatā	sastavadbhyām	sastavadbhiḥ
Dative	sastavate	sastavadbhyām	sastavadbhyaḥ
Ablative	sastavataḥ	sastavadbhyām	sastavadbhyaḥ
Genitive	sastavataḥ	sastavatoḥ	sastavatām
Locative	sastavati	sastavatoḥ	sastavatsu

Compound sastavat -

Adverb -sastavantam