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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It would be nice to have a little more feedback on what is wrong with the code rather than just displaying "This is not the optimal solution".
Maybe something like "This is not the optimal solution. Try using less power to reach the target".