Declension table of ?śaśvacvas

Masculine	Singular	Dual	Plural
Nominative	śaśvacvān	śaśvacvāṃsau	śaśvacvāṃsaḥ
Vocative	śaśvacvan	śaśvacvāṃsau	śaśvacvāṃsaḥ
Accusative	śaśvacvāṃsam	śaśvacvāṃsau	śaśvacuṣaḥ
Instrumental	śaśvacuṣā	śaśvacvadbhyām	śaśvacvadbhiḥ
Dative	śaśvacuṣe	śaśvacvadbhyām	śaśvacvadbhyaḥ
Ablative	śaśvacuṣaḥ	śaśvacvadbhyām	śaśvacvadbhyaḥ
Genitive	śaśvacuṣaḥ	śaśvacuṣoḥ	śaśvacuṣām
Locative	śaśvacuṣi	śaśvacuṣoḥ	śaśvacvatsu

Compound śaśvacvat -

Adverb -śaśvacvas