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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.
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In Javascript, the test 10 says expected 0 instead got 1. In the array there is one unique number and my code is displaying it correctly.
I console log the array to check and should be correct