Trying to map a 2d array into a disk

can you explain it? When you deal with modular arithmetic you can not order numbers, less than or greater than makes no sense. Because modular arithmetic loops numbers, you take a piece of a number line and glue the ends together, then you can not say one number is less than the other, in a way all numbers will be less then all the other numbers (including the compared number) and also all number will be greater than all the other numbers. So for all numbers A and B, A < B and A > B at the same time and that is meaning less and useless.

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