AABB
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3
Since Takahashi scored 11 point, we see that he solved only the 11-point problem and failed to solve the other two.
Similarly, since Aoki scored 22 points, we see that he solved only the 22-point problem and failed to solve the other two.
Therefore, Snuke must have solved the 11- and 22-point problems, but not the 44-point one, which Takahashi and Aoki both failed to solve, for a score of 33 points. Thus, 33 should be printed.