1, 2, 3, 4, 5, 6, 7, 8, 9
11, 22, 33, 44, 55, 66, 77, 88, 99
111, 222, 333, 444, 555, 666, 777, 888, 999
1111, 2222, 3333, 4444
123, 234, 456, 789, 1234
121, 212, 1221, 2112
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