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Earned on 9 Mar 2013 for commenting on Problem 294. A stroll on the beach: finding a route round a ....
Must have 50 solvers for a problem you created.
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Earned on 16 Aug 2013 for solving 500 problems.
Must receive 50 total likes for the solutions you submitted.
Must receive 10 likes for a solution you submitted.
Must receive 25 total likes for the problems you created.
Must receive 10 likes for a problem you created.