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Given a set of words words, write a program to find out the longest word, and the word is made up of other words in the group. If there are multiple results of the same length, the one with the smallest dictionary order is returned, and if there are no words that meet the requirements, an empty string is returned.

Example:

Input: ["cat", "banana", "dog", "nana", "walk", "walker", "dogwalker"]

Output: "dogwalker"

Explanation: "dogwalker" can consist of "dog" and "walker".

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