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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.
Having a bit of an issue with this kata, all I'm getting when I run my test is a "missing language" error. My answer works in Repl, so I'm not sure what the problem could be, are there missing instructions or something?