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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.
Alright a hotfix to the Codemirror mode was just deployed, it should be working for you now.
Very strange. Looking at your code, I believe that the codemirror mode gets stuck and hangs when it encounters
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when the bracket is unmatched. I will try fix it as soon as possible (Note that this will apply to any LC kata, not just this one).