Declension table of ?sammantavya

Neuter	Singular	Dual	Plural
Nominative	sammantavyam	sammantavye	sammantavyāni
Vocative	sammantavya	sammantavye	sammantavyāni
Accusative	sammantavyam	sammantavye	sammantavyāni
Instrumental	sammantavyena	sammantavyābhyām	sammantavyaiḥ
Dative	sammantavyāya	sammantavyābhyām	sammantavyebhyaḥ
Ablative	sammantavyāt	sammantavyābhyām	sammantavyebhyaḥ
Genitive	sammantavyasya	sammantavyayoḥ	sammantavyānām
Locative	sammantavye	sammantavyayoḥ	sammantavyeṣu

Compound sammantavya -

Adverb -sammantavyam -sammantavyāt