Question: BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each.
Try to answer this question if possible: Which navigational system is national and consists of four satellites? 
Answer: unanswerable
Question: In March 2006, it was revealed by the Archivist of the United States in a public hearing that a memorandum of understanding between NARA and various government agencies existed to "reclassify", i.e., withdraw from public access, certain documents in the name of national security, and to do so in a manner such that researchers would not be likely to discover the process (the U.S. reclassification program). An audit indicated that more than one third withdrawn since 1999 did not contain sensitive information. The program was originally scheduled to end in 2007.
Try to answer this question if possible: What did the Archivist of the US and researchers have between them?
Answer: unanswerable
Question: National Basketball Association teams play eight preseason games per year. Today, NBA teams almost always play each other in the preseason, but mainly at neutral sites within their market areas in order to allow those who can't usually make a trip to a home team's arena during the regular season to see a game close to home; for instance the Minnesota Timberwolves will play games in arenas in North Dakota and South Dakota, while the Phoenix Suns schedule one exhibition game outdoors at Indian Wells Tennis Garden in Indian Wells, California yearly, the only such instance an NBA game takes place in an outdoor venue.
Try to answer this question if possible: What basketball Association placed eight postseason games
Answer: unanswerable
Question: The Ministry of Defence (MoD) is the British government department responsible for implementing the defence policy set by Her Majesty's Government, and is the headquarters of the British Armed Forces.
Try to answer this question if possible: Who implements the location of Her Majesty's Government?
Answer:
unanswerable