However, the great advantage of enumerations over sets is that they are ordered and they force the brain to list them always in the same order. An ordered list of countries contains more information than the set of countries that can be listed in any order. Paradoxically, despite containing more information, enumerations are easier to remember.
Enumerations are sets with a particular order. The fact that they have an order, in which each item might be associated with the next, makes them easier to remember.
The greater information in an enumeration provides additional structure which makes the items easier to remember.