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1100, 1210, 2100, 2110, 3100, 3110, 4100, 5100, 6100 ...

  1100,  1210,  2100,  2110,  3100,  3110,  4100,  5100,  6100
1100, 1210, 2100, 2110, 3100, 3110, 4100, 5100, 6100 ( )
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: " "