通常，从右到左排列，最右边的数字是最低有效位。
Usually, you order them from right to left, with the right-most digit being the least significant digit.
重复上面的步骤，但是这一次从右向左，移除最右侧的数字，然后从剩余的数字中每隔一位移除一个数字。
Repeat the previous step again, but this time from right to left, remove the right most number and every other number from the remaining numbers.
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