One semester in a chemistry class, 14 students failed due to a poor attendance, 24 failed due to not studying, 14 failed because they did not turn in assignments, 8 failed because of poor attendance and not studying, 7 failed because of not studying and not turning in assignments, 4 failed because of poor attendance and not turning in assignments, and 2 failed because of all three of these reasons. (a) How many failed for exactly two of the three reasons?

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