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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, thanks for your report
In ruby, returning any integer will cause the test cases to pass. Was confused why I was passing the fixed ones but not the random ones and I just had some logic backwards and I should have been failing all of the fixed ones too.