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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.
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If long pins was a concern you could check the 6th index and bin the pin if it is not null/none.
Tho I don't know how big the pins has to be before it becomes a problem
sort
isO(n log n)
, what you propose is worse.