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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.
The issue is already raised below.
Yeah, I don't like it, too. Simplest way to reslove the issue would be, if not to remove, then at least to ovewrite a kata when refactored. New solutions would be added only via 'submit final'. In the beginning I thought refactoring overwrites and ended up with 10 versions of a kata I can't remove..
You can't remove your solutions :/ If you have multiple solutions, all of them will be visible.