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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.
I totally agree. Solving the problem should be front and center. Optimization increases the difficulty and should be a separate kata. I won't be back for sure. I already passed the first set of tests and that's enough for me.