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The Colossal Book of Short Puzzles and Problems: Gardner, Martin, Richards, Dana: 9780393061147: Amazon.com: Books
![AMSP London & South East on Twitter: "The puzzles so far set for Maths England week have just been a warmup! Today we have a Martin Gardner puzzle, who would have been AMSP London & South East on Twitter: "The puzzles so far set for Maths England week have just been a warmup! Today we have a Martin Gardner puzzle, who would have been](https://pbs.twimg.com/media/FD0cxy_X0AEDdi0.png)
AMSP London & South East on Twitter: "The puzzles so far set for Maths England week have just been a warmup! Today we have a Martin Gardner puzzle, who would have been
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