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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.
Well, quite original and unique but slow anyway. the "+=" action is a slow solution. Look through other's works (Except linq if you don't know it yet). Anyway, good job!
This is generisable. You can change to any subsitution cypher you like, not just ROT.
Well..did didn't think this myself, so very clever.
Though this isn't really that generizable method.
But it works, and answers the question asked.