Append the following sentence to the rule “Innovation”:

At any time, a District may move one Innovation within the table of Innovations so that it is directly below another Innovation that is listed in its prerequisites, or directly above another Innovation that lists it as a prerequisite.

In the same rule, after “The Innovations that a District understands are tracked in a public list.”, add the following sentence:

If a District understands an Innovation but no longer understands a different Innovation which is listed as one of its prerequisites, then the understood Innovation’s effect no longer applies to that District until it regains all of the understood Innovation’s prerequisite Innovations.