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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.
Thanos was right.
well try returning aaa instead of printing it because many of the times it specified in the challenge "function must return" something like that so try return.