If ``r'' is selected in #14.2 or #14.3, the rule for each individual cell may be revised. Note that this only applies to a mixed rule network, not to a ``single rule`` set in #13.3. However, a rule mix where all the rule are the same can be set up as described in #13.3.1. A secondary window is presented in the lower right corner of the screen, with rule selection prompts. The various methods for revising and re-selecting rules are described in #13.6 and #13.6.1-16. Once complete, the new rule is displayed in the rule window, and the program returns to the prompt at #14.2 or #14.3, which allows moves to other cells. To change a rule to one with a different neighbourhood size k (in a rule mix), first change k in the rewiring window (#14.5.1), then change the rule.