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There is no such thing called margin for mistake, or a chance. There is no undo button, you will eventually deal with your mess on your own with nobody else to blame, bad enough life doesn't come with a manual of instructions, no matter how much you want to avoid making mistakes watching other's closely you will end up failing and it can accumulate to an extremely ridiculous amount, you will be held responsible for it, even though some may tell you that it's only natural to make mistakes that won't make dealing with them that easy.