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You can explore interesting problems on this site. Solved and unsolved. Find the right for you.

You can solve the problem, collaborate and win the honor prize. It's fun, you can do it on your spare time.

You will develop your skills on solving unsolvable. Try to solve at least some of the problems.

Your solution shouldn't be right ones. Thoughts and propositions are very welcomed.

I've invented it during one of my previous jobs, when we had a problem for connecting related graphs.

Full description will be available soon.