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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.
No.
Yeah so it is running arbitrary scripts, but not on a host machine. Arbitrary scripts are run in an isolated container.
(I cannot see the solution but) what else would it do when you type in your code and press SUBMIT? It basically runs your code. Whatever you type in.