Declension table of ?astamana

Neuter	Singular	Dual	Plural
Nominative	astamanam	astamane	astamanāni
Vocative	astamana	astamane	astamanāni
Accusative	astamanam	astamane	astamanāni
Instrumental	astamanena	astamanābhyām	astamanaiḥ
Dative	astamanāya	astamanābhyām	astamanebhyaḥ
Ablative	astamanāt	astamanābhyām	astamanebhyaḥ
Genitive	astamanasya	astamanayoḥ	astamanānām
Locative	astamane	astamanayoḥ	astamaneṣu

Compound astamana -

Adverb -astamanam -astamanāt