The term 'Capital Cameroon' refers to the capital city of Cameroon, Yaounde, which has seven letters. Nigeria, another nation in the region, also has a seven-letter capital city, Abuja. Gabon's capital is Libreville, with five letters, and CHAD's capital is N'Djamena, with four letters. The term 'IAN' refers to the International African NATIONS, a group of NATIONS in Africa that includes Cameroon, Nigeria, Gabon, and CHAD. The acronym for this group is IAN, with three letters. Finally, the term 'NATIONS' refers to the NATIONS of the International African NATIONS, which are Cameroon, Nigeria, Gabon, and CHAD, all with seven letters.