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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.
It actually takes 3N iterations. The result can be found by the third number, so no real need to loop further.
Sometimes I feel we FE devs get so caught up in functional programming we forget about efficiency of implementation.