Declension table of ?triyavastha

Neuter	Singular	Dual	Plural
Nominative	triyavastham	triyavasthe	triyavasthāni
Vocative	triyavastha	triyavasthe	triyavasthāni
Accusative	triyavastham	triyavasthe	triyavasthāni
Instrumental	triyavasthena	triyavasthābhyām	triyavasthaiḥ
Dative	triyavasthāya	triyavasthābhyām	triyavasthebhyaḥ
Ablative	triyavasthāt	triyavasthābhyām	triyavasthebhyaḥ
Genitive	triyavasthasya	triyavasthayoḥ	triyavasthānām
Locative	triyavasthe	triyavasthayoḥ	triyavastheṣu

Compound triyavastha -

Adverb -triyavastham -triyavasthāt