The book records ordinary ʿaṣāya / raḥāya and the Hudhayl forms ʿaṣiyya / raḥiyya.
This is a dialectal variant, not a blanket permission to switch every maqṣūr noun at will. Learn the common pattern first.
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The Hudhayl Variant Is Dialect-Specific
Iḍāfah to Yāʾ al-Mutakallim and the Six Nouns
The book records ordinary ʿaṣāya / raḥāya and the Hudhayl forms ʿaṣiyya / raḥiyya.
This is a dialectal variant, not a blanket permission to switch every maqṣūr noun at will. Learn the common pattern first.