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A transformation sequence from word beginWord to word endWord using a dictionary wordList is a sequence of words beginWord - s1 - s2 - ... - sk such that:

Every adjacent pair of words differs by a single letter.
Every si for 1 less than = i less than = k is in wordList. Note that beginWord does not need to be in wordList.
sk == endWord
Given two words, beginWord and endWord, and a dictionary wordList, return all the shortest transformation sequences from beginWord to endWord, or an empty list if no such sequence exists. Each sequence should be returned as a list of the words [beginWord, s1, s2, ..., sk].



Example 1:

Input: beginWord = "hit", endWord = "cog", wordList = ["hot","dot","dog","lot","log","cog"]
Output: [["hit","hot","dot","dog","cog"],["hit","hot","lot","log","cog"]]
Explanation: There are 2 shortest transformation sequences:
"hit" - "hot" -"dot" - "dog" - "cog"
"hit" - "hot" - "lot" -"log" - "cog"

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