EXAMPLE: A RULE USED IN PLAYING CARDS

Think about the rules of any card game that you know. In most games the rules do not tell you what card to play. Instead they tell you what cards you may not play in any given situation.

Sometimes these rules are expressed as negative constraints, as in, "You can't play a red jack on a black king," and sometimes as positive constraints, as in, "You must follow suit."

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As practice, you might choose a card game that you are familiar with and explain how the rules of the game produce various patterns of play. Does it seem to be true that the games with more complex patterns of play have more rules? q3006