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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.
How do I understand which tests were used in the section "More complicated tests"? Otherwise I won't understand how to fix the code. All other tests are solved correctly.