After Conan had been sick for a week, he asked his best friend Haibara to get his books out of his locker. Instead of telling Haibara the three number combination Conan said he kept a small piece of paper with the combination under his locker door.
After school Haibara went to Conan's locker and pulled the paper. On the paper was written:
24-24-22-9-9-9-9-22-24-22-9-9
Thinking this would be easy but a little tedious, Haibara entered in every arrangement of 24, 22, and 9 there was without the lock opening. Realizing there was something behind these numbers that she wasn't noticing, Haibara sat down for a few minutes to think it out. After ten minutes of intense thinking, Haibara went to the locker, entered the combination into the lock and it opened
What was the combination?