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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.
I don't think this is a 5kyu kata. Its more like an 8kyu kata. The problem is essentially a puzzle, and has nothing to do with the coding part. Once we solve the puzzle, coding the program is simple.
Clever solution. I just made mine unncecssarily complicated, at least part of it.
Learnt new stuff.