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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.
The same: same kind of digits, same amount of each of them. Technically, yes, it's a permutation. I think if it were like you mentioned first then that should be explicitly mentioned and because the same means what I said, explaining it is not needed.