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* LOCATIONS: Locations reviewed by users. (Restaurants, clubs, museums, etc)
Relations
* city : city that the trip review refers to
* country: the country where the city is located
* explores: users browse through cities to explore sites of interests and see their friends' reviews
* knows: A users can “add” other users to see their trips and reviews
* lived in: users keep track of the cities they have lived in
messages: users can send messages to inquire about reviews / trips
* reviews: users review their trips 