Please post all quotes separately, so that they can be upvoted or downvoted separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
Do not quote yourself.
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No case studies, I'd be interested to hear of any. At university I was part of a society for a competitive game with an evolving ruleset, and making that distinction explicit was one of the things we experimented with.
Rules: