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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.
The way I understand is that the array should start with the longest possible sequence of unique elements, moving all duplicated entries to the end of the list without changing the order.