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Mathematical Puzzles
Dual Cryptograms
Daily Cryptogram
A cryptogram is a message encrypted in codes, where each letter in the code represents another letter of the alphabet. Decode the following cryptogram of the day:
Martin Gardner's Corner
Aha! Gotcha : Paradoxes to Puzzle and Delight
Hexaflexagons and Other Mathematical Diversions : The First Scientific American Book of Puzzles and Games
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