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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 don't encourage students to code in this way. What if they have to migrate to another language without all these tricky utils?
Neat code, but relies too much on java built in library. Hard to maintain.