I have a list of lists. I want to collect all of the sublists with the same first element, combine their elements, and remove duplicates. I'm getting close, but my current solution dies on an index error.I have a list of lists. I want to collect all o
阅读背景：
比较子列表的第一个索引（在列表列表中），然后将其转换为集合并返回
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