Declension table of ?avartra

Neuter	Singular	Dual	Plural
Nominative	avartram	avartre	avartrāṇi
Vocative	avartra	avartre	avartrāṇi
Accusative	avartram	avartre	avartrāṇi
Instrumental	avartreṇa	avartrābhyām	avartraiḥ
Dative	avartrāya	avartrābhyām	avartrebhyaḥ
Ablative	avartrāt	avartrābhyām	avartrebhyaḥ
Genitive	avartrasya	avartrayoḥ	avartrāṇām
Locative	avartre	avartrayoḥ	avartreṣu

Compound avartra -

Adverb -avartram -avartrāt