Declension table of ?sapatnatva

Neuter	Singular	Dual	Plural
Nominative	sapatnatvam	sapatnatve	sapatnatvāni
Vocative	sapatnatva	sapatnatve	sapatnatvāni
Accusative	sapatnatvam	sapatnatve	sapatnatvāni
Instrumental	sapatnatvena	sapatnatvābhyām	sapatnatvaiḥ
Dative	sapatnatvāya	sapatnatvābhyām	sapatnatvebhyaḥ
Ablative	sapatnatvāt	sapatnatvābhyām	sapatnatvebhyaḥ
Genitive	sapatnatvasya	sapatnatvayoḥ	sapatnatvānām
Locative	sapatnatve	sapatnatvayoḥ	sapatnatveṣu

Compound sapatnatva -

Adverb -sapatnatvam -sapatnatvāt