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