Beer is located at shelf. Illegal drug cannot have a location of public aquarium. Room is located at office. Bookshelf is located at room. Office is located at paper. Something is located at room. Illegal drug is located at shelf. Bookshelf cannot have a location of database. Pen is located at paper. Paper is located at shelf. Bookshelf cannot have a location of stadium. Card case is located at public aquarium. Room is made of four wall.
Bookshelf is located at shelf.