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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.
For some of the language implementations (like Rust) I would recommend showing what the input of the failing tests are for the full suite. It's hard to know why a final submit isn't passing when all of the example tests pass, and I can only see what the expected output, and actual output are, but not the input.