An example of code from history that I know is Morse. Figure as shown below is the international Morse code.
In Vietnam, Morse code is used as a game for students when organizing the outdoor camping. It is a team game. There are number of codes that the organizer will set up at different stations. The task of each team is to decode at each station when the organizer encodes through the sound signals. Which team decode and find the code fastest and correctly will win the game.
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