Declension table of ?yuyuvas

Masculine	Singular	Dual	Plural
Nominative	yuyuvān	yuyuvāṃsau	yuyuvāṃsaḥ
Vocative	yuyuvan	yuyuvāṃsau	yuyuvāṃsaḥ
Accusative	yuyuvāṃsam	yuyuvāṃsau	yuyūṣaḥ
Instrumental	yuyūṣā	yuyuvadbhyām	yuyuvadbhiḥ
Dative	yuyūṣe	yuyuvadbhyām	yuyuvadbhyaḥ
Ablative	yuyūṣaḥ	yuyuvadbhyām	yuyuvadbhyaḥ
Genitive	yuyūṣaḥ	yuyūṣoḥ	yuyūṣām
Locative	yuyūṣi	yuyūṣoḥ	yuyuvatsu

Compound yuyuvat -

Adverb -yuyuvas