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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.
When you submite your code, it is usually tested a much larger and comprehensive test suite than the examples provided.
I have added more example tests to reduce the chance of a wrong solution slipping by, but it is still possible to get errors on submit while passing the example tests.