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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 have the exact same issue with failing tests 5, 14, and 15. I didn't know anything about upper limits of data types so I am going to research further to see if I can find anything. Did you figure this one out? I don't want the answer just any guidance in the right direction if you have it :-)