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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.
The instruction examples are very poor. The errors don't show the input so it's a guess game to understand what they precisely expect... I've spend way more time trying to understand how they want us to "cut" the words than actually work on the solution... I hope they will clarify the examples!