Declension table of ?sammantavya

Masculine	Singular	Dual	Plural
Nominative	sammantavyaḥ	sammantavyau	sammantavyāḥ
Vocative	sammantavya	sammantavyau	sammantavyāḥ
Accusative	sammantavyam	sammantavyau	sammantavyān
Instrumental	sammantavyena	sammantavyābhyām	sammantavyaiḥ sammantavyebhiḥ
Dative	sammantavyāya	sammantavyābhyām	sammantavyebhyaḥ
Ablative	sammantavyāt	sammantavyābhyām	sammantavyebhyaḥ
Genitive	sammantavyasya	sammantavyayoḥ	sammantavyānām
Locative	sammantavye	sammantavyayoḥ	sammantavyeṣu

Compound sammantavya -

Adverb -sammantavyam -sammantavyāt