Declension table of ?trapta

Neuter	Singular	Dual	Plural
Nominative	traptam	trapte	traptāni
Vocative	trapta	trapte	traptāni
Accusative	traptam	trapte	traptāni
Instrumental	traptena	traptābhyām	traptaiḥ
Dative	traptāya	traptābhyām	traptebhyaḥ
Ablative	traptāt	traptābhyām	traptebhyaḥ
Genitive	traptasya	traptayoḥ	traptānām
Locative	trapte	traptayoḥ	trapteṣu

Compound trapta -

Adverb -traptam -traptāt