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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.
That's funny, I'm having a problem with the random tests in Ruby too, but whereas yours expected just a small part of the string, mine expected an empty string:
There's a problem with the submission tests in the Ruby version- the expected answer for all the randomly generated strings is ""!