Kjartan Poskitt

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Isaac Newton and His Apple

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Codes: How to Make Them and Break Them

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Desperate Measures (Murderous Maths)

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Do you feel lucky? : the secrets of probability

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Everyday Maths for Grown-Ups

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Kakuro and Other Fiendish Number Puzzles (Murderous …

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Karmea totuus matikasta

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Professor Fiendish's Book of Diabolical Brain-bende …

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Su Doku (Murderous Maths S.)

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The 122 Turn-offs