A code is a way to send a message while keeping it a secret from someone who isn't supposed to know about it. Codes can be easy or complicated - the trick to to make sure the person on the receiving end of your secret message has the key to decode it without making it too easy for anyone else to crack. One simple code you can use is the pigpen code. In the pigpen code, each letter is represented by part of the 'pigpen' that surrounds it. If it's the second letter in the box, then it has a dot in the middle like so:
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