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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.
In case of reduce, initial value is the first element of the list. For puprose of this kata we can assume list is not empty so initial value is not needed. Take a look at kata details.