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The Most Difficult Logic Problems: Test Your Powers of Reasoning with Hundreds of Exacting Enigmas (Most Difficult The)
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The Most Difficult Math Tests: Prove Your Arithmetic Prowess by Solving These Tough Numerical Puzzles (Most Difficult The)
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The Most Difficult Pattern Puzzles: Unleash Your Creative Problem-Solving to Crack These Demanding Conundrums (Most Difficult The)
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