Task: Question Generation
Input (English): Passage: The front of the palace measures 108 metres (354 ft) across, by 120 m (390 ft) deep, by 24 m (79 ft) high and contains over 77,000 m2 (830,000 sq ft) of floorspace. The floor area is smaller than the Royal Palace of Madrid, the Papal Palace and Quirinal Palace in Rome, the Louvre in Paris, the Hofburg Palace in Vienna, and the Forbidden City. There are 775 rooms, including 188 staff bedrooms, 92 offices, 78 bathrooms, 52 principal bedrooms, and 19 state rooms. It also has a post office, cinema, swimming pool, doctor's surgery, and jeweller's workshop.The principal rooms are contained on the piano nobile behind the west-facing garden façade at the rear of the palace. The centre of this ornate suite of state rooms is the Music Room, its large bow the dominant feature of the façade. Flanking the Music Room are the Blue and the White Drawing Rooms. At the centre of the suite, serving as a corridor to link the state rooms, is the Picture Gallery, which is top-lit and 55 yards (50 m) long. The Gallery is hung with numerous works including some by Rembrandt, van Dyck, Rubens and Vermeer; other rooms leading from the Picture Gallery are the Throne Room and the Green Drawing Room. The Green Drawing Room serves as a huge anteroom to the Throne Room, and is part of the ceremonial route to the throne from the Guard Room at the top of the Grand Staircase. The Guard Room contains white marble statues of Queen Victoria and Prince Albert, in Roman costume, set in a tribune lined with tapestries. These very formal rooms are used only for ceremonial and official entertaining, but are open to the public every summer.Directly underneath the State Apartments are the less grand semi-state apartments. Opening from the Marble Hall, these rooms are used for less formal entertaining, such as luncheon parties and private audiences. Some of the rooms are named and decorated for particular visitors, such as the 1844 Room, decorated in that year for the state visit of Tsar Nicholas I of Russia, and the 1855 Room, in honour of the visit of Emperor Napoleon III of France. At the centre of this suite is the Bow Room, through which thousands of guests pass annually to the Queen's Garden Parties. The Queen and Prince Philip use a smaller suite of rooms in the north wing.
Output (English): What is the name given to the set of rooms used used for less formal entertaining, such as luncheon parties and private audiences?