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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.
I couldn't even get spaces instead of nulls.
It's pretty normal here on Codewars. You will get used to this feeling ;)
Besides, shorter does not always mean better.