The author, Ibn Warraq, states that the people of the Sudan are of two kinds: those who are of Arab origin and those who are of the Sudan. He mentions that the Arabs are divided into two groups: the Banu Hilal and the Banu Sulaym. He also states that the Sudan are divided into two groups: the Fur and the Daju. He further states that the Fur are divided into two groups: the Fur and the Daju. He also states that the Daju are divided into two groups: the Daju and the Fur.