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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.
There is a bug in the test cases which will return
NaNif your solution is returning non-numbers.But the test cases are locked so it can't be changed anymore. It also doesn't affect correct solutions. Which means you need to try harder ;-)