D1212121212131323223313233231323331313232213231333132313132333132313221   >>    D121212121213132322331323323132333131323221323133313231313233313231322   <<    D1212121212131323223313233231323331313232213231333132313132333132313223   >>      D1212121212131323223313233231323331313232213231333132313132333132313222   >>