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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.
Don't post solutions in discourse please. And use proper code formatting.
xo('xxxoo') is expected to return False, not xo('xxxoo') is True then. The error message is shown if your function didn't return False, got it?