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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.
Just check the documentation and do it yourself. :)
https://docs.oracle.com/javase/8/docs/api/java/util/stream/package-summary.html
Use
System.out.println(s);to see why.Not an issue.
You dont need to type anything in the test cases. Those are for testing. There are test cases written for when you submit it.
I ocmpleted this challenge with no effort, using Java. So I know it's not broken.