Add a new dynastic rule to the ruleset. Call it “Stamps” and give it the following text:

Various rules award Stamps to visitors. Each Stamp has a letter associated with it, for example a “Z stamp”, defaulting to Z.

Each Visitor has a Stamp Collection, which is a set of stamps they have been awarded. A Visitor’s Stamp Collection is tracked in the Information Center as a text string consisting of the associated letters of each of their stamps in alphabetical order, for example “CPZ” denoting the C, P and Z stamps. A visitor can only have one stamp associated with each letter, such that gaining a stamp they already have has no effect. New Visitors start with “Z” as their stamp collection - they are immediately awarded a Z stamp upon becoming a Visitor.

Stamps cannot be lost once gained except by CfJ or by the repeal of this rule. The Proprietor should veto proposals that award Visitors stamps they have not earned.