In [19]: l=[[1,2,3],[4,5,6],[7,8,9]]
In [20]: l
Out[20]: [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
In [21]: l[1]
Out[21]: [4, 5, 6]
In [22]: l[1][2]
Out[22]: 6
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