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给定两个数组，编写一个函数来计算它们的交集。
示例 1:
输入: nums1 = [1,2,2,1], nums2 = [2,2] 输出: [2]
示例 2:
输入: nums1 = [4,9,5], nums2 = [9,4,9,8,4] 输出: [9,4]
说明:
输出结果中的每个元素一定是唯一的。 我们可以不考虑输出结果的顺序。
附leetcode地址：leetcode