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Alan Turing's Puzzle Machine: 100 Number Puzzles
(Part of Alan Turing's Puzzle Machine)
Emily Stead and Lucy Doncaster
Trade Paperback$13.99
Alan Turing's Puzzle Machine: 100 Brain Teasers
(Part of Alan Turing's Puzzle Machine)
Emily Stead and Lucy Doncaster
Trade Paperback$13.99



















