Declension table of ?pratyāsana

Neuter	Singular	Dual	Plural
Nominative	pratyāsanam	pratyāsane	pratyāsanāni
Vocative	pratyāsana	pratyāsane	pratyāsanāni
Accusative	pratyāsanam	pratyāsane	pratyāsanāni
Instrumental	pratyāsanena	pratyāsanābhyām	pratyāsanaiḥ
Dative	pratyāsanāya	pratyāsanābhyām	pratyāsanebhyaḥ
Ablative	pratyāsanāt	pratyāsanābhyām	pratyāsanebhyaḥ
Genitive	pratyāsanasya	pratyāsanayoḥ	pratyāsanānām
Locative	pratyāsane	pratyāsanayoḥ	pratyāsaneṣu

Compound pratyāsana -

Adverb -pratyāsanam -pratyāsanāt