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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.
Overall really fun Kata. Recommended kata really helped me out when solving. Only issue I had was that the way errors were described was really ambiguos. It sounded like they wanted you to handle the error checking and throw a formatted string as an error with a return, when in reality they handle error checking and just want you to let it throw the true error.