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    One of the test cases that you fail on is is_merge('codewars', 'code', 'wasr'). Your code returns True, but should be False.

    If you try to put these strings on top of each other like in the description, you'll see that it's not possible. By using sort, you lose all information about order.

    Let me know if you need more nudges in the right direction.

    Happy coding! :-)