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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.
I think the author prefers people to find out how to handle duplicates by reading the discourse section, since the vague note in the instructions, "(with <)" has been unchanged despite all the suggestions to clarify it.