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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.
I was facing the same problem and then i realised some of the inputs contains 'prohibited characters' such as underscores, hyphens, periods, numbers, speech brackets and more! Once I removed those from the phrase, I was able to pass all the tests.