Problem 2: In a school's educational trip, 80 students brought sandwiches, drinks and candies. 5 students brought sandwiches, candies and drinks 50 students brought sandwiches 30 students brought drinks 30 students brought candies 18 students brought candies and drinks 15 students brought sandwiches and candies 8 students brought sandwiches and drinks How many did not bring any of the 3 kinds?

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