题目:统计一个字符串中每个字母出现的频率(忽然大小写),然后按照从高到低输出频率高于2次的单词和出现的频率。 代码: string strabc = "hello chenchen is me,are you ok?"; var items=strabc.Where(c => char.IsLetter(c)).Select(c => char.ToLower(c)).GroupBy(c => c).Select(
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