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Provide your first answer ever to someone else's question
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Answer 1 question that was unanswered for more than 30 days
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Solve all the problems in Cody5:Easy
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Comment on a problem or solution
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Solve all the problems in Computation Geometry I
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Solve a problem with a best solution
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Solve all the problems in Draw Letters problem group
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Solve all the problems in Introduction to MATLAB problem group
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Solve a problem for the first time
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