D1212121212131323223313233231323331313232233132323132313233313133221   >>    D121212121213132322331323323132333131323223313232313231323331313322   <<    D1212121212131323223313233231323331313232233132323132313233313133223   >>      D1212121212131323223313233231323331313232233132323132313233313133222   >>