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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.
Test failure message for Java is backwards. The "expected" portion of the message displays what is computed by our code.. not what was actually expected in the test.