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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 like that it's iterative, but it would be faster if you maintained a count of opens and a count of closes as variables rather than calling out to this countOpens/countCloses function which loops through n elements again.