Two two-digit number will get a four-digit divided into two sections, the square of their sum is equal to the original number of this nature there are no special distribution, so a brute-force method to judge all four digits, thus screened-digit meets this nature. Specific algorithm is either to take a four-digit, it cut into two parts, the first two of a, after two of b, and then apply the formula to calculate and determine the nature.

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