A swimmer-training program has 26 students specializing in the butterfly stroke, 24 specializing in the breaststroke, and 29 specializing in the backstroke. Of these students, 5 students are specializing in all three strokes, 5 are specializing in only the breaststroke and the backstroke, 8 are specializing in only the butterfly stroke, and 11 are specializing in only the backstroke. How many students are in the swimmer-training program?
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