Its simple, think of all the countries in the world, and the sort them in your head by how many times the letter E appears in the country name.
Where multiple countries both have 2 Es in their name for example, then you put the countries in alphabetical order.
Official common UN names to be used, e.g "THE Gambia" but not "Republic of the Gambia"
Côte d'Ivoire is not included, as it is officially Ivory Coast