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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.
Quite an easy question to solve. However, there should be a mention to someone new to codewars how to supply a string to the function. If it wasn't for one of the comments, I wouldn't know that you have to use
thiskeyword. The description needs more work.