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FILE - Warren Buffett, Chairman and CEO of Berkshire Hathaway, speaks during a game of bridge after the annual Berkshire Hathaway shareholders meeting in Omaha, Neb., on May 5, 2019. (AP Photo/Nati Harnik, File)

FILE - Warren Buffett, Chairman and CEO of Berkshire Hathaway, speaks during a game of bridge after the annual Berkshire Hathaway shareholders meeting in Omaha, Neb., on May 5, 2019. (AP Photo/Nati Harnik, File)

FILE - Berkshire Hathaway managers and members of the board of directors Matt Rose, CEO of BNSF, left, and Walter Scott, member of the board, walk to a Burlington Northern Santa Fe passenger train in Omaha, Neb., April 30, 2010, after their traditional lunch with Warren Buffett. (AP Photo/Nati Harnik, File)

FILE - Berkshire Hathaway managers and members of the board of directors Matt Rose, CEO of BNSF, left, and Walter Scott, member of the board, walk to a Burlington Northern Santa Fe passenger train in Omaha, Neb., April 30, 2010, after their traditional lunch with Warren Buffett. (AP Photo/Nati Harnik, File)