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For example, if the word “attic” isn’t in your code book, you can’t say, “Hide the money in the attic.”

Simple codes like this are easy to remember, but anything complicated will need a code book, which can be hard to lug around.

They believed that these numbers could be related to a Chinese code book.

But it seemed like maybe Mom had given Emma the first code book; it seemed like Mom might have said something like, “Sometimes kids who like math also like codes.”

“Students are also expected to adhere to guidance provided to them regarding the distribution of these materials. Any disciplinary measures are in accordance with the Code Book of Student Conduct,” they said, declining to comment further due to student privacy.