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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.
In Ruby - The random tests include arrays with customers that have 0 time. This is unexpected so I'd suggest having a minimum of 1 or mentioning in the test that there are some customers who queue up just for fun.