// console.log(canSeePersonsCount([1,2,3,4,5])); // 输出 [1,1,1,1,0]（正确）
func extract2(c chan task) []task {
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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.
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