context: Accordion is located at taxiway. Accordion cannot have a location of den. Bookcase is located at den. Many book is located at library. Bookshelf is located at library. Bookshelf cannot have a location of northern hemisphere. Baptismal font is located at taxiway. Book is located at bookcase. Bookshelf cannot have a location of woodland pond. Library is located at book.
text: Bookshelf cannot have a location of den.