Create a new rule in Rule Section 3 (that is, the Glossary), named “Lists”, which reads:

A “list” is a collection of “list items”, where each list item is composed by one or more words. When a list is defined, it shall be enclosed in curly braces: “{" and "}”, and each list item shall be separated from the previous one with a comma: “,”. The order of the values on a list is considered part of the definition of a list (meaning, it shall not be modified unless the definition of the list is itself modified). A list may be used to specify the valid set of values that an attribute (of any kind) can take. If an attribute defined by a list is “upgraded” it means that the value of the attribute shall be replaced by the value after the current one in the list. If an attribute is “downgraded”, it means that its value is set to the previous one in the list. An attribute defined by a list may not be upgraded or downgraded past the beginning or end of the list.

I am sure this can help us in future dynasties when we choose to go this route again.