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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.
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some of them have already paid tution and some haven't
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Easy, but there's two problems: You ask to avoid 'The US', and it should be 'USA' or it will crash. It's silly, but it'll avoid one failed attempt for someone who take it literal.
I couldn't use the 'NOT CONTAINS' , and i think it's a valid answer for this example.
Great Kata!
Maybe in order to learn beginners better practices, you should either include NULL values into the country column of travelers or add a DESCRIBE of the table to the description where we can see the column having a NOT NULL contraint.
I think this would teach good practices to beginners. Feel free to discuss what you think!