If I have a matrix given as a list of rows [[1,2,3],[4,5,6]], I want to return the first column, [1,4]. I'm an absolute beginner in Haskell and I have no idea on even how to deal with nested lists.If I have a matrix given as a list of rows [[1,
阅读背景：
作为Haskell中的行列表给出的矩阵的第一列
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