8 If finite games must be externally bounded by time, space, and number, they must also have internal limitations on what the players can do to and with each other. To agree on internal limitations is to establish rules of play. The rules will be different for each finite game. It is, in fact, by knowing what the rules are that we know what the game is. What the rules establish is a range of limitations on the players: each player must, for example, start behind the white line, or have all debts paid by the end of the month, charge patients no more than they can reasonably afford, or drive in
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