Obtain 50 solvers for a problem you have created
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Answer 1 question that was unanswered for more than 30 days
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Provide your first answer ever to someone else's question
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Solve all the problems in Indexing II
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Be the first to solve a problem
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Create a problem
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Like a problem or solution
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Solve a problem with a best solution
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Comment on a problem or solution
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Solve a problem for the first time
Awarded to Informaton on 24 Apr 2017
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