# Functions
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字符串元素是否在数组中.
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*
* 删除某元素
*/.
获取s1和s2的差集含义：在s1不在s2中的数组.
对比两个数组值是否完全相等包括顺序.
判断字符串是否存在于sice中.
字符串slice获取交集.
字符串slice获取并集.
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