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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.
Well, the ones that have been updated might not work with the old version, so on most, it will probably be disabled.
Its because some katas haven't been updated yet, so the version hasn't been removed yet. It will be removed eventually.
Make sure you have GHC 8.2 selected.