10. 落地节奏（建议 3 周）
Medium difficulty hints, answers for Feb. 27 PipsNumber (4): Everything in this space must add up to 4. The answer is 2-1, placed horizontally; 2-2, placed vertically.
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He identified creating a hand as one of the three most difficult problems facing makers of humanoid robotics. The other two were creating an artificial intelligence that allowed the robot to comprehend the world, and making robots in large numbers.
let minVal = Infinity;