Explanation of a testcase


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    A

    For input: ["ab","adc"] I think the order should be "abdc", however the expected output is "abcd". Can someone please explain ?

    Since "d" is a prefix of "c", d should come before c. Or I am interpreting "You may assume that if a is a prefix of b, then a must appear before b in the given dictionary." incorrectly.


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