Declension table of ?tripastya

Neuter	Singular	Dual	Plural
Nominative	tripastyam	tripastye	tripastyāni
Vocative	tripastya	tripastye	tripastyāni
Accusative	tripastyam	tripastye	tripastyāni
Instrumental	tripastyena	tripastyābhyām	tripastyaiḥ
Dative	tripastyāya	tripastyābhyām	tripastyebhyaḥ
Ablative	tripastyāt	tripastyābhyām	tripastyebhyaḥ
Genitive	tripastyasya	tripastyayoḥ	tripastyānām
Locative	tripastye	tripastyayoḥ	tripastyeṣu

Compound tripastya -

Adverb -tripastyam -tripastyāt