Declension table of ?sahatva

Neuter	Singular	Dual	Plural
Nominative	sahatvam	sahatve	sahatvāni
Vocative	sahatva	sahatve	sahatvāni
Accusative	sahatvam	sahatve	sahatvāni
Instrumental	sahatvena	sahatvābhyām	sahatvaiḥ
Dative	sahatvāya	sahatvābhyām	sahatvebhyaḥ
Ablative	sahatvāt	sahatvābhyām	sahatvebhyaḥ
Genitive	sahatvasya	sahatvayoḥ	sahatvānām
Locative	sahatve	sahatvayoḥ	sahatveṣu

Compound sahatva -

Adverb -sahatvam -sahatvāt