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Be the first to solve a problem
Awarded to david hansen on 11 May 2016
Create a problem
Awarded to david hansen on 11 May 2016
Solve all the problems in CUP Challenge
Awarded to david hansen on 08 Apr 2016
Solve all the problems in ASEE Challenge
Awarded to david hansen on 07 Apr 2016
Comment on a problem or solution
Awarded to david hansen on 06 Sep 2013
Like a problem or solution
Awarded to david hansen on 06 Sep 2013
Solve a problem for the first time
Awarded to david hansen on 26 Oct 2012
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