Declension table of ?saptanidhana

Neuter	Singular	Dual	Plural
Nominative	saptanidhanam	saptanidhane	saptanidhanāni
Vocative	saptanidhana	saptanidhane	saptanidhanāni
Accusative	saptanidhanam	saptanidhane	saptanidhanāni
Instrumental	saptanidhanena	saptanidhanābhyām	saptanidhanaiḥ
Dative	saptanidhanāya	saptanidhanābhyām	saptanidhanebhyaḥ
Ablative	saptanidhanāt	saptanidhanābhyām	saptanidhanebhyaḥ
Genitive	saptanidhanasya	saptanidhanayoḥ	saptanidhanānām
Locative	saptanidhane	saptanidhanayoḥ	saptanidhaneṣu

Compound saptanidhana -

Adverb -saptanidhanam -saptanidhanāt