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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'm a little bit confused. My program fails on test cases, but succedes when submitted. I'm using java language and it fails with a single argument. It looks like you are testing if i return a single string instead of reading from array.