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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.
Actually the long version here is wrong. 'return' is given inside the for loop which is wrong. You must be able to understand this now as I can see you are now 5kyu.
Personally I don't like the oneliners since they are not very readable.