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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 are not going to spoil that much with an example yielding 2 or 3, especially due to the meeting difficulty being linked to nested brackets.
I think an example would be too much of a spoiler