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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.
Clever, but the use of -1 from the return really makes me cringe. ;)
Can't understand why more people doesn't take the recursive route.
The exercise feels really made for it.