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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.
This is nicely compact.
I didn't know about string +=, handy.
Entirely up to you.
This is the language's version of randomisation.
One hour to write this, 2.5 hours to find a really dumb tiny bug.
Hot damn am I glad to have solved this though, very fun puzzle, albeit cruel :P