Not enough test cases

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    At first, I used the digits of the key words in the HashMap, THOUGH ACCEPTED, I think there is a bug.
    For example, abc could be "012" using my method. However, am could also be regarded as 012. And they will be in the same group with my "accepted" wrong method.

  • 0

    Done. I've just added the test case ["abc","am"].

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