Declension table of ?yāpyatva

Neuter	Singular	Dual	Plural
Nominative	yāpyatvam	yāpyatve	yāpyatvāni
Vocative	yāpyatva	yāpyatve	yāpyatvāni
Accusative	yāpyatvam	yāpyatve	yāpyatvāni
Instrumental	yāpyatvena	yāpyatvābhyām	yāpyatvaiḥ
Dative	yāpyatvāya	yāpyatvābhyām	yāpyatvebhyaḥ
Ablative	yāpyatvāt	yāpyatvābhyām	yāpyatvebhyaḥ
Genitive	yāpyatvasya	yāpyatvayoḥ	yāpyatvānām
Locative	yāpyatve	yāpyatvayoḥ	yāpyatveṣu

Compound yāpyatva -

Adverb -yāpyatvam -yāpyatvāt