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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.
fixed
This kata was solved 9 times in Java, so I think the test cases are correct.
So what is the problem? Maybe post your code here and we will see, if there is a problem in your code.