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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.
It is probably because some of the test cases are automatically generated
I've run the same solution a couple times and have gotten different results in terms of how many of the test cases I get right