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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.
There are no errors in the kata. Print the input to see where your problem is.
I always like reading code with streams, though am still not used to them. Can you explain why creating n double arrays is faster than using a for loop?