What you are doing there is no for. Not in the mathematical sense of “for all values in a set”. The semantic of the word “for” should matter. If you want to ite

What you are doing there is no for. Not in the mathematical sense of “for all values in a set”. The semantic of the word “for” should matter. If you want to iterate 2 variables i and j is much better to do it explicitly. It will be much more readable.