Do you know when you're testing your code and anything works as it should, even when everything looks all right? I dunno how about you, but... everytime this happens, I just change var/function name to something like "fuckingCalculate()" or "suckerAvg". It's similar as punching an old TV everytime it stops, or kicking a door that doesn't open.
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Once I change the var/function to It's previous name, everything stops working as before.
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What a shame...