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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.
Turns out you're right! Thank you. Didn't think about it when I submitted.
Should specify that NaN is a valid input.
After reading this, I feel so stupid, haha. Well done!