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示例：nums = [2,1,2,4,3] → res = [4,2,4,-1,-1]。。业内人士推荐电影作为进阶阅读
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Each puzzle features 16 words and each grouping of words is split into four categories. These sets could comprise of anything from book titles, software, country names, etc. Even though multiple words will seem like they fit together, there's only one correct answer.