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Unknown, 1985
Current format, Unknown, 1985, 1st U.S.A. ed., No Longer Available.
Unknown, 1985
Current format, Unknown, 1985, 1st U.S.A. ed., No Longer Available. Offered in 0 more formats
Three children, Tom, Hannah, and Shadowchild, who represents the reader, are made to guess, using the concept of binary logic, the color of the hats on their heads. An introduction to logical thinking and mathematical problem-solving.
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