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Example: An Educational Game (CRC Cards)

• First we list the nouns:

  Player	Clock	Time
  Level	Game	Round

• Level is just an integer between 1 and 4; it doesn't need a class.
• Start with a simple class: the Clock class.
• When a clock draws itself, it must draw the hands to show the current time.
• To get the current time, it must collaborate with the Time class.
• How does the clock know what time it is? You need to tell it:

  Clock

  draw Time

  set time

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