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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.
It doesn't matter, because there will only be two different numbers in the array as per instructions:
This solution does not work with array like this:
[2,2,5,7,7,7,2](it would return 7, what isn't the unique number in the array)
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