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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 is an accepted solution, so this issue seems resolved. Was your earlier code really correct?
The expected outcomes were incorrect on some of the unit tests. I wasn't able to submit my correct code :/