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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.
Your comment helped me, I wondered why it didn't work for 20 and came to read the comments to see if there was a problem with the test cases, but no it was my own code. Rounding errors on rows 11 and 15.