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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.
Hi- "Assume that the front person in the queue proceeds to a till as soon as it becomes free."
In your case the last person would go to the second till (the first to become free).