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Among the class of 70 students, every student plays at least one of the given sports: hockey, basketball and volleyball. To be precise, 33 of them play hockey, 25 of them play basketball, 32 of them play volleyball, 20 of them play hockey and basketball, 19 of them play hockey and volleyball, 22 of them play basketball and volleyball, and 17 students play all the three sports. Find the number of students who play:
(i) Only hockey \(=\)
(ii) Only volleyball \(=\)