The game of Ibish is played in rounds. In the first round, you earn 0, 10 or 11 points; in the second round, you earn 0, 10, 11 or 12 points; in the third round, you earn 0, 10, 11, 12 or 13 points, and so on, including the next greatest integer in the possible point values. What is the fewest number of rounds after which your total score can have a 9 in the units digit?
