The following ER diagram describes a database about bands and their tours within the United States. A tour consists of a sequence of cities visited by a band. We assume that no city is visited twice on a single tour, and on one date, a band can visit only one city. Some of the entity sets are weak, and some of the relationships are supporting many-one relationships, but all double rectangles and double diamonds are not shown. [You may recognize this diagram from a Gradiance question.] Give the SQL CREATE TABLE statements needed to implement this database as a normalized set of relations. Clearly state any additional assumptions you make