Declension table of ?yāpaka

Neuter	Singular	Dual	Plural
Nominative	yāpakam	yāpake	yāpakāni
Vocative	yāpaka	yāpake	yāpakāni
Accusative	yāpakam	yāpake	yāpakāni
Instrumental	yāpakena	yāpakābhyām	yāpakaiḥ
Dative	yāpakāya	yāpakābhyām	yāpakebhyaḥ
Ablative	yāpakāt	yāpakābhyām	yāpakebhyaḥ
Genitive	yāpakasya	yāpakayoḥ	yāpakānām
Locative	yāpake	yāpakayoḥ	yāpakeṣu

Compound yāpaka -

Adverb -yāpakam -yāpakāt