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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.
You can use it on an array, the input is not an array (see description). Please don't raise issues when you just don't know, an issue is a bug in the kata, not your code not working.