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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.
No issue here. You have an error in your code, but not where you are actually checking right now... ;)
Keep in mind that the goal of the kata isn't only to search for a word.