And does that rule apply across zones? Then I keep getting stuck. But if it's only within zones, then I break rule 3. Or, it seems, it means something else
There's an undocumented feature where you can click a rule and it'll check only that one, so you might be able to experiment with that and figure out the rule. ROT-13 spoiler: gur ehyr qbrf abg gnxr mbar obhaqnevrf vagb pbafvqrengvba ng nyy