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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 user can modify the input.
Returning empty list for no packages does not make sense at all: there is a sensible default value for no packages, which is all
0
s.