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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 have a similar approach but I just use the core of rot13. It seems that I can't call the WORDS variable corrctly. My program is calling itself endless times because it can't find the ouput from rot13 in WORDS...
You should maybe specify the closes 'bigger' numbers. Beside from that your explanation helped!