Declension table of ?yāvayitavya

Neuter	Singular	Dual	Plural
Nominative	yāvayitavyam	yāvayitavye	yāvayitavyāni
Vocative	yāvayitavya	yāvayitavye	yāvayitavyāni
Accusative	yāvayitavyam	yāvayitavye	yāvayitavyāni
Instrumental	yāvayitavyena	yāvayitavyābhyām	yāvayitavyaiḥ
Dative	yāvayitavyāya	yāvayitavyābhyām	yāvayitavyebhyaḥ
Ablative	yāvayitavyāt	yāvayitavyābhyām	yāvayitavyebhyaḥ
Genitive	yāvayitavyasya	yāvayitavyayoḥ	yāvayitavyānām
Locative	yāvayitavye	yāvayitavyayoḥ	yāvayitavyeṣu

Compound yāvayitavya -

Adverb -yāvayitavyam -yāvayitavyāt