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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.
This code is not correct. Random tests are incomplete in several languages, that's why your solution can pass them. This is related to the issue opened just below.
This is not an issue (= a bug in the kata).