I'm thinking of finding a combination using itertools in a three-dimensional array.
I would like to find the total combination of li1[i] to choose one by one.
For example, if you combine the beginnings of li1[i], li1→li1→li1→li1li1 to [0,2,3,7,9,11,12,10,20].
It doesn't matter if you don't use itertools.Thank you for your cooperation.python
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