Task: Question Generation
Input (English): The Federal Reserve began taking high-denomination currency out of circulation (destroying large bills received by banks) in 1969. As of May 30, 2009, only 336 $10,000 bills were known to exist; 342 remaining $5,000 bills; and 165,372 remaining $1,000 bills. Due to their rarity, collectors often pay considerably more than the face value of the bills to acquire them. Some are in museums in other parts of the world.
Output (English): did they used to make 1000 dollar bills?