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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.
It isn't multiple strings, but the random generated strings can be things like
-hello_world
you have to be able to combine both cases including nonsensical names as no one starts with - or _
The description isn't clear. I only found this out by trail and error and seeing where my would fail.