Declension table of ?pratyavasāna

Neuter	Singular	Dual	Plural
Nominative	pratyavasānam	pratyavasāne	pratyavasānāni
Vocative	pratyavasāna	pratyavasāne	pratyavasānāni
Accusative	pratyavasānam	pratyavasāne	pratyavasānāni
Instrumental	pratyavasānena	pratyavasānābhyām	pratyavasānaiḥ
Dative	pratyavasānāya	pratyavasānābhyām	pratyavasānebhyaḥ
Ablative	pratyavasānāt	pratyavasānābhyām	pratyavasānebhyaḥ
Genitive	pratyavasānasya	pratyavasānayoḥ	pratyavasānānām
Locative	pratyavasāne	pratyavasānayoḥ	pratyavasāneṣu

Compound pratyavasāna -

Adverb -pratyavasānam -pratyavasānāt