Declension table of ?pratyasta

Neuter	Singular	Dual	Plural
Nominative	pratyastam	pratyaste	pratyastāni
Vocative	pratyasta	pratyaste	pratyastāni
Accusative	pratyastam	pratyaste	pratyastāni
Instrumental	pratyastena	pratyastābhyām	pratyastaiḥ
Dative	pratyastāya	pratyastābhyām	pratyastebhyaḥ
Ablative	pratyastāt	pratyastābhyām	pratyastebhyaḥ
Genitive	pratyastasya	pratyastayoḥ	pratyastānām
Locative	pratyaste	pratyastayoḥ	pratyasteṣu

Compound pratyasta -

Adverb -pratyastam -pratyastāt