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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.
The random tests in Groovy appear to be mixing up the two arguments - they pass a series of '/' as a top and a series of spaces as a roof. Basic tests and example tests are all passing for my solution.
Failed cases should supply the entire string of inputs