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- Mathematical problems of counting circles
Mathematical problems of counting circles
6666 = 4 1 1 1 has no cycle, so there are 0 2222 without cycle and 0 3333. Similarly, 4444 has four cycles, so there is one in 4 1234 4, so there are two in 1 5678 6, so
It is said that this is a kindergarten promotion exam and a civil service exam.
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