Declension table of ?sevāvasara

Masculine	Singular	Dual	Plural
Nominative	sevāvasaraḥ	sevāvasarau	sevāvasarāḥ
Vocative	sevāvasara	sevāvasarau	sevāvasarāḥ
Accusative	sevāvasaram	sevāvasarau	sevāvasarān
Instrumental	sevāvasareṇa	sevāvasarābhyām	sevāvasaraiḥ sevāvasarebhiḥ
Dative	sevāvasarāya	sevāvasarābhyām	sevāvasarebhyaḥ
Ablative	sevāvasarāt	sevāvasarābhyām	sevāvasarebhyaḥ
Genitive	sevāvasarasya	sevāvasarayoḥ	sevāvasarāṇām
Locative	sevāvasare	sevāvasarayoḥ	sevāvasareṣu

Compound sevāvasara -

Adverb -sevāvasaram -sevāvasarāt