Declension table of ?sāttra

Neuter	Singular	Dual	Plural
Nominative	sāttram	sāttre	sāttrāṇi
Vocative	sāttra	sāttre	sāttrāṇi
Accusative	sāttram	sāttre	sāttrāṇi
Instrumental	sāttreṇa	sāttrābhyām	sāttraiḥ
Dative	sāttrāya	sāttrābhyām	sāttrebhyaḥ
Ablative	sāttrāt	sāttrābhyām	sāttrebhyaḥ
Genitive	sāttrasya	sāttrayoḥ	sāttrāṇām
Locative	sāttre	sāttrayoḥ	sāttreṣu

Compound sāttra -

Adverb -sāttram -sāttrāt