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Semaphore is a way to signal the alphabet using two flags, one held in each hand.
To send a message, your left and right hands have to be in two different positions. You start with both hands pointing down.
Here are the signals for the letters of the alphabet:
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What does this message say?
You might want to send a message that contains more than just letters (exclamation marks, question marks, full stops etc). How many other symbols could you send using this code?