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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.
For what? I don't think that someone would get any benefit of cheating. However it's not very pleasant to see that your solution passes the "open" testcases and fails on hidden ones - without any explanation...