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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.
It tells you right in the second sentence that the number of cards goes up to
10**18
though?Edit: I've added the
performance
tag to be even more clear.