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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 was feeling pleased that I found and multiplied the digits without converting/parsing strings, but this method of doing it is brilliant!
The iterations skip i == 0, so there isn't any leading whitespace