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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.
Try to print the town given as input to stderr. BTW with Shell translation you dont have to return the mean (description says "Shell tests only variance").