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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.
Looks like it was fixed at some point.
Description updated.
Sample code is wrong, change method name to are_you_playing_banjo
You can, but not for inline code examples, only code blocks. Simply create two blocks back to back and tag each with their language.
It looks like there is no way to specify different kata description for JS and Ruby. (Maybe I just cannot find it though).