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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.
Yeah, it's a bit shortcoming.
but I like the func toHex in func rgb, which keep not expose the inner func to the out scope!