Declension table of ?yūpaka

Neuter	Singular	Dual	Plural
Nominative	yūpakam	yūpake	yūpakāni
Vocative	yūpaka	yūpake	yūpakāni
Accusative	yūpakam	yūpake	yūpakāni
Instrumental	yūpakena	yūpakābhyām	yūpakaiḥ
Dative	yūpakāya	yūpakābhyām	yūpakebhyaḥ
Ablative	yūpakāt	yūpakābhyām	yūpakebhyaḥ
Genitive	yūpakasya	yūpakayoḥ	yūpakānām
Locative	yūpake	yūpakayoḥ	yūpakeṣu

Compound yūpaka -

Adverb -yūpakam -yūpakāt