Declension table of ?yasta

Masculine	Singular	Dual	Plural
Nominative	yastaḥ	yastau	yastāḥ
Vocative	yasta	yastau	yastāḥ
Accusative	yastam	yastau	yastān
Instrumental	yastena	yastābhyām	yastaiḥ yastebhiḥ
Dative	yastāya	yastābhyām	yastebhyaḥ
Ablative	yastāt	yastābhyām	yastebhyaḥ
Genitive	yastasya	yastayoḥ	yastānām
Locative	yaste	yastayoḥ	yasteṣu

Compound yasta -

Adverb -yastam -yastāt