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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.
I had the same problem. It means that the function is not running the "correct" number of times. I had to change my original working code to accomodate the checking program. What I thought/think is the best solution doesn't run the exact number of times that is expected by the program.