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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.
The requirements were not consistant with the answer for the Test. None != NaN. math library has an nan which should have been the correct answer.
Very nice!
Buddy, just because people can (and did) hardcode solutions to solve this issue, doesn't mean your kata doesn't have an issue.