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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.
Ehh, I guess people didn't really like it? It is pretty trivial to do if you know about a certain java keyword and don't mind copy-pasting a bunch of very similar code, but if you go with Reflection then it's super-duper advanced, so that could be why... if this had a sister kata with a character limit that was >3 kyu then that'd probably be okay, but I've always hated kata where it's like "yeah if you don't have a CS PHD and don't wanna cheat your butt off then you ain't doing this one buster."