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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 tried to write a random test, what do you think ?
About the description, my english is not the best, I struggle a bit to describe this function.
Grouping/matching repeating elements has certainly been done before, although I can't remember any specific examples. Leaving it here as a "note" for now.