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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.
expected NaN but it's 6, why? I passed all tests, but I got that mistake when I pressed attempt and I don't know how to see where is a mistake, in desc no info about "when I should to return NaN?"???