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Consider the following sequence of digits where gaps have been placed to indicate the pattern. 1 2 3 11 12 13 21 22 23 31 32 33 111 112 113 121 122 123 131 132 133 211 212 213 221 222 223 231 232 233 311 312.... Thus, for example, the 10th digit in this sequence is 2， the 20th digit is 3, and the 30th also 3. Find the 2011th digit in this sequence. |
