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  11. Only a Few Have Solved This Puzzle—Will You Be Next?

    Only a Few Have Solved This Puzzle—Will You Be Next?

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  17. If You Solve This, Your IQ Is Well Above Average

    If You Solve This, Your IQ Is Well Above Average

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  18. The Harvard Logic Test—Can You Get It Right?

    The Harvard Logic Test—Can You Get It Right?

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  19. An IQ Test That’s Harder Than You’d Ever Expect

    An IQ Test That’s Harder Than You’d Ever Expect

    15
  20. The IQ Puzzle That’s Driving the Internet Crazy

    The IQ Puzzle That’s Driving the Internet Crazy

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