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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.
Thanks for noticing!
I didn't know about and while I was doing this exercise and found it only later in solutions of others. And after some time I feel it is confusing even for me to understand my "all id"
Oh, right, thanks a lot.