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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.
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Well it appears I too am stuck here. There is no log for what arrays are actually entered so I have no way to test it specifically.
I read through the suggestion above, and it basically tells me where to identify and test, but in this case that information isn't here.
Great Kata, really got me thinking.
In my opinion it seems a little high in difficulty for a 7kyu, but outside of that this was a great thinker.