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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.
you are supposed to return the output, not print it
p.s., this is not a kata issue. kata issues are bugs in the kata. use the question tag next time