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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.
According to the insturctions, it should return two closest pairs, in this case, those will be 3 and 7 - they form the sum 10 faster than 5 and 5 because the last 5 is far down the array.