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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.
See this point, it explains how to check the input of the test case.
It means that your solution returned
truefor a test case which expected the answer offalse.Check out this FAQ, there you could find some useful info how to find problems with your solution.