[C# solution] 2 lines of code, beat 100% submission running time
\npublic class Solution {\n    public string[] UncommonFromSentences(string A, string B) {\n        var arr = (A + \' \' + B).Split(\' \');\n        return arr.
```\npublic class Solution {\n    public string[] UncommonFromSentences(string A, string B) {\n        var arr = (A + \' \' + B).Split(\' \');\n        return arr.Where(ar => arr.Count(a => a == ar) == 1).ToArray();\n    }\n}\n```
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