Declension table of ?sāsya

Neuter	Singular	Dual	Plural
Nominative	sāsyam	sāsye	sāsyāni
Vocative	sāsya	sāsye	sāsyāni
Accusative	sāsyam	sāsye	sāsyāni
Instrumental	sāsyena	sāsyābhyām	sāsyaiḥ
Dative	sāsyāya	sāsyābhyām	sāsyebhyaḥ
Ablative	sāsyāt	sāsyābhyām	sāsyebhyaḥ
Genitive	sāsyasya	sāsyayoḥ	sāsyānām
Locative	sāsye	sāsyayoḥ	sāsyeṣu

Compound sāsya -

Adverb -sāsyam -sāsyāt