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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.
I have updated the description to specify using a lambda, can you please re-review?
This is right. The submission tests expect the method to receive a proc as a parameter, not a block like the description states. It's a great kata though, I want to see more like these and less like random algorithms. Thank you, Lordnibbler!