| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 19, 80, 91, 191, 808, 919, 1919, 8080, 9191, 19191, 80808, 91919, 191919, 808080, 919191, 1919191, 8080808, 9191919, 19191919, 80808080, 91919191, 191919191, 808080808, 919191919, 1919191919, 8080808080
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