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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.
take a closer look at the examples in the description, seems that you are missing a part
edit : i skipped a line in what you posted (remember to mark it as spoiler next time) : try printing the faulty inputs