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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.
This one is the slickest!
As usual, that happens when you modify the input array.
I just fiddled with your code a bit and the array is changed after running your function.
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