List all cities that cannot be reached from seattle through a direct flight -- nor with one stop (i. e., with any two flights that go through an intermediate -- city). warning: this query might take a while to execute. we will learn about -- how to speed this up in lecture. (15 points) -- name the output column city. order the output ascending by city. -- (you can assume all cities to be the collection of all origin_city or all dest_city) -- (note: do not worry if this query takes a while to execute. we are mostly concerned with the results) -- [output relation cardinality: 3 or 4, depending on what you consider to be the set of all cities]