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Every one used to say that "You don't be worry when you make mistake because you can learn many things from it". I think this idea is very exactly. In life, even if you had thought very carefully, you can't always avoid mistake, but when you make mistake, you shouldn't be sad or disheartened because they don't help you to resolve anything. The more important thing you should do is to find why you be failed. After that, you can have some experiences and when you have a similar problem, you can do it successfully.