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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.
If you mean variable names don't match, that's because different languages use different styles, and the translators didn't use conditional formatting to show it. I've added conditional formatting and fixed Ruby tests.