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Like a problem or solution.
Create a problem.
Solve a problem with a best solution.
Must have 50 solvers for a problem you created.
Create 10 problems.
Earned on 3 Oct 2015 for solving 500 problems.
Solve all the problems in Modeling and Simulation Challenge 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.