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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.
There should be more info on the test results, like show the inputs for which we're failing the test. As a beginner it's very hard to find for which input I failed the test.