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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 cardinality of the array (no. of elements)
Silly question, but what is |A| supposed to represent in the instructions? Is it the result, element in the a array, or something else?