أَمَّا فِي الْقِسْمِ الْأَوَّلِ؛ فَلِبَقَاءِ الِاسْمِ بِلَا سَبَبٍ.
Translation: In the first group, no relevant preventing cause remains.
وَأَمَّا فِي الْقِسْمِ الثَّانِي؛ فَلِبَقَائِهِ عَلَى سَبَبٍ وَاحِدٍ.
Translation: In the second group, only one cause remains.
The author’s reasoning is about the causes of diptote status, not merely a change in written endings.
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Restoring Declension: Indefinite Names, Al- and Iḍāfah
أَمَّا فِي الْقِسْمِ الْأَوَّلِ؛ فَلِبَقَاءِ الِاسْمِ بِلَا سَبَبٍ.
Translation: In the first group, no relevant preventing cause remains.
وَأَمَّا فِي الْقِسْمِ الثَّانِي؛ فَلِبَقَائِهِ عَلَى سَبَبٍ وَاحِدٍ.
Translation: In the second group, only one cause remains.
The author’s reasoning is about the causes of diptote status, not merely a change in written endings.