Why "wke" selected as substring in this example and why not "kew"?

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    Given "pwwkew", the answer is "wke", with the length of 3. Note that the answer must be a substring, "pwke" is a subsequence and not a substring.

    I do not understand that in the Example # 3, it mentions 'wke' as the longest substring. Why not "kew" selected as the longest one? Help here is much appreciated.

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