In عَصَا, the final alif is written «ا»; in فَتَى and الْهُدَى, it is written «ى». Both spellings can occur in maqṣūr nouns.
Important: A final alif is not restricted to the written shape «ى».
These two extra words are teaching examples; the book’s principal example is عَصَا.
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Noun Case Class 7 — Maqṣūr and Nouns with Possessive Yāʾ
In عَصَا, the final alif is written «ا»; in فَتَى and الْهُدَى, it is written «ى». Both spellings can occur in maqṣūr nouns.
Important: A final alif is not restricted to the written shape «ى».
These two extra words are teaching examples; the book’s principal example is عَصَا.