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* In place of calculating the factorial several times we can run a loop k times to calculate the combination
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* Replacing the generator with numpy vector operations from lu_decomposition.
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* ValueError: Number 22.2 must instead be a positive integer
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This is complex code so let's use self-documenting function and variable names to help readers to understand.
We should not shorten names to simplify the code formatting but use understandable name and leave to code formatting to psf/black.
I am not sure if `nbor` was supposed to be `neighbour`. ;-)
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