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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.
(not to everyone... ;p )
Besides python test cases are locked.
After 63k completions nobody is going to change it. It would be unfair and would render all solutions invalid.