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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.
My solution did not past all the tests but I could submit it. In my attempts somehow it passt the tests. It should be some leak at the tests.