أَفْضَلَانِ ← أَفْضَلَا الْقَوْمِ
Dual afḍalān loses its final nūn on becoming mudāf: afḍalā al-qawmi. The nominative dual alif remains.
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Dual Agreement and Loss of Nūn
Ism al-Tafḍīl: Formation, Comparison, Agreement and Parsing
أَفْضَلَانِ ← أَفْضَلَا الْقَوْمِ
Dual afḍalān loses its final nūn on becoming mudāf: afḍalā al-qawmi. The nominative dual alif remains.