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已知选修课学生名单：course1 = {"张三", "李四", "王五"}, course2 = {"李四", "赵六", "王五"}。要找出同时选修两门课的学生，选出符合要求的推导式。
{x for x in course1 if x in course2}
[x for x in course1 and course2]
{x for x in course1 or course2}
{x for x in course1 if x not in course2}