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books in Psychology & Reference in Mathematics

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Most Difficult Maths Tests ( Mensa ) Prove Your Arithmetic Prowess By Solving These Tough Numerical Puzzles by Ltd Mensa

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Most Difficult Pattern Puzzles ( Mensa ) Unleash Your Creative Problem Solving To Crack These Demanding Conundrums by Ltd Mensa

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Most Difficult Geometric Puzzles ( Mensa ) Tricky Puzzles To Challenge Every Angle by Graham Jones

Mensa's Most Difficult Geometric Puzzles provides an exceptional challenge for even the most adept of puzzlers. The high IQ society's most ingenious puzzle ...

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Most Difficult Logic Problems ( Mensa ) Test Your Powers Of Reasoning With Exacting Enigmas by Gareth Moore

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Original Area Mazes, Vol. 2 by Inaba Naoki Murakami Ryoichi

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