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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.
can be done in linear time
but with more code "noise"
This is probably the most simple, yet most refined solution. Wish I had done the same