Declension table of ?siṣiṭvas

Masculine	Singular	Dual	Plural
Nominative	siṣiṭvān	siṣiṭvāṃsau	siṣiṭvāṃsaḥ
Vocative	siṣiṭvan	siṣiṭvāṃsau	siṣiṭvāṃsaḥ
Accusative	siṣiṭvāṃsam	siṣiṭvāṃsau	siṣiṭuṣaḥ
Instrumental	siṣiṭuṣā	siṣiṭvadbhyām	siṣiṭvadbhiḥ
Dative	siṣiṭuṣe	siṣiṭvadbhyām	siṣiṭvadbhyaḥ
Ablative	siṣiṭuṣaḥ	siṣiṭvadbhyām	siṣiṭvadbhyaḥ
Genitive	siṣiṭuṣaḥ	siṣiṭuṣoḥ	siṣiṭuṣām
Locative	siṣiṭuṣi	siṣiṭuṣoḥ	siṣiṭvatsu

Compound siṣiṭvat -

Adverb -siṣiṭvas