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Earned on 11 Nov 2012 for solving Problem 1. Times 2 - START HERE.
Earned on 23 Nov 2012 for liking Solution 106420.
Earned on 14 Dec 2012 for commenting on Solution 170292.
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Earned on 19 Nov 2012 for first solving Problem 1038. Change the sign of even index entries of the r....
Solve all the problems in CUP Challenge problem group.
Solve a problem with a best solution.
Must have 50 solvers for a problem you created.
Solve all the problems in Tiles Challenge problem group.
Solve all the problems in ASEE Challenge problem group.
Solve all the problems in Cody Challenge problem group.
Create 10 problems.
Solve 500 problems.
Solve all the problems in Modeling and Simulation Challenge problem group.
Solve all the problems in Magic Numbers problem group.
Must receive 25 total likes for the problems you created.
Must receive 50 total likes for the solutions you submitted.
Must receive 10 likes for a solution you submitted.
Must receive 10 likes for a problem you created.
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