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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.
You can't. But you can throw Exception. Check test's code.
You should use "\u00A3" instead of "£" symbol.
Maybe it's too late to explain, but..
Try to STDOUT your "n" after you initialize it, and you'll get an answer. ;) Not enough cases.