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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.
I thought that in case two numbers have the same number of ocurrences, the first of them in the original array should be picked, no?
Although yeah, it is not obvious from the proposition.