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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 submitting, some of the random tests failed. I suspect there is an error in your check for certain random values. Re-submitting a few times eventually got the random tests to pass.