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The Penguin Book of Puzzles
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The GCHQ Puzzle Book II
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The GCHQ Puzzle Book
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Why machines learn
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Is maths real?
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Mathematical intelligence
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Numbers
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Mathematical Intelligence
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At Sixes and Sevens
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The Language Lover’s Puzzle Book
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Maths On The Back Of An Envelope
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GCHQ 2
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The GCHQ Puzzle Book
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