I just spent two days on writing, testing, rewriting, testing, debugging, etc, a piece of code only to find the error to be five misplaces pixels. Learn from my mistake: never use i and j as index in nested loops.
What made this problem worse than it should have needed to be was that the erroneous code was in a test-case. Learn from my mistake: never write complex control flow in your test code.
What made it take longer than it should have take for me to find this mistake was that I didn't assert my assumptions. Learn from my mistake: always assert, never assume anything of any piece of code when you're chasing weird behavior.
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