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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.
CW solution revalidation issues...
the specs of the sheffer function have changed in the meantime
Why is it invalid solution? Strange to see it right after passing the tests, anyway.