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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.
Maybe the tests weren't strict at the time this solution passed them or they got lucky with the random tests. Sometimes the solutions aren't revalidated and some of them won't pass the tests anymore but they still show in Solutions tab.