Declension table of ?sayatva

Neuter	Singular	Dual	Plural
Nominative	sayatvam	sayatve	sayatvāni
Vocative	sayatva	sayatve	sayatvāni
Accusative	sayatvam	sayatve	sayatvāni
Instrumental	sayatvena	sayatvābhyām	sayatvaiḥ
Dative	sayatvāya	sayatvābhyām	sayatvebhyaḥ
Ablative	sayatvāt	sayatvābhyām	sayatvebhyaḥ
Genitive	sayatvasya	sayatvayoḥ	sayatvānām
Locative	sayatve	sayatvayoḥ	sayatveṣu

Compound sayatva -

Adverb -sayatvam -sayatvāt