Declension table of ?sadayatva

Neuter	Singular	Dual	Plural
Nominative	sadayatvam	sadayatve	sadayatvāni
Vocative	sadayatva	sadayatve	sadayatvāni
Accusative	sadayatvam	sadayatve	sadayatvāni
Instrumental	sadayatvena	sadayatvābhyām	sadayatvaiḥ
Dative	sadayatvāya	sadayatvābhyām	sadayatvebhyaḥ
Ablative	sadayatvāt	sadayatvābhyām	sadayatvebhyaḥ
Genitive	sadayatvasya	sadayatvayoḥ	sadayatvānām
Locative	sadayatve	sadayatvayoḥ	sadayatveṣu

Compound sadayatva -

Adverb -sadayatvam -sadayatvāt