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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 description needs to include that the number of movies is limited, as with a large number of movies this is NP complete and a good solution would be much outside the bounds of a kata :)
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I don't think the level is correct - this isn't a 4kyu kata.
I followed this after doing the ES5 Generator(i). I understood the description, though i did have to look at my solution to (i) to remember the behavior of the generate method. I really liked these Kata's.