36 students take the Discrete Structures class. They had 3 quizzes called X, Y, and Z. Surprisingly, only 1 student did not get an A on any quiz while the rest of the students got an A (aced) on at least one quiz. 21 students aced X, 19 students aced Y, and 17 students aced Z. 9 students aced both X and Y, 11 students aced both X and Z, and 8 students aced both Y and Z. How many students aced at least one quiz? *

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