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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.
My code is passing everything except the last test case. This has been driving me mad, could someone tell me what the test case is, so I can finally solve this! please. Edit: I'm using Javascript.