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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.
Don't think this a great kata, mostly a math question. Really doesn't challenge anyone's programming skills in the slightest.
Found out in Java I was failing the (8th) last test since my program for some reason couldn't handle ' . ' chars. Just having it skip that fixed it.