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Make them, break them and baffle everyone with them! Master the secrets of the world’s most cryptic codes! What’s the secret code for pepperoni pizza? When is a letter a key? How do you make an Enigma machine? Find out in this murderously funny guide to code-making and code-breaking!
January 4th, 2010
AR book level: 6.4; Middle years; 4.0 points
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