الطَّالِبُونَ أَفْضَلُ الْقَوْمِ. / الطَّالِبُونَ أَفْضَلُو الْقَوْمِ.
The definite-addition option allows invariant afḍalu or masculine-plural afḍalū (without the normal plural nūn because of iḍāfah).
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Definite Iḍāfah with a Plural
Ism al-Tafḍīl: Formation, Comparison, Agreement and Parsing
الطَّالِبُونَ أَفْضَلُ الْقَوْمِ. / الطَّالِبُونَ أَفْضَلُو الْقَوْمِ.
The definite-addition option allows invariant afḍalu or masculine-plural afḍalū (without the normal plural nūn because of iḍāfah).