Description: Verify Kaprekar operation. Any one of the four-digit, as long as their individual bits on the same figures are incomplete, there is such a law: 1) the composition of the four four-digit numbers in descending order, formed by the composition of the four figures the largest four-digit 2) will be composed of the four-digit number from small to big four are arranged to form constituted by these four numbers, the smallest of the four-digit (if it contains the number of 4 0, then the number of less than 4) 3) Find the difference between two numbers, get a new four-digit (high to zero reservations).
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