D1212121212131323223313233231323331313232233132323132323132313231111   >>    D121212121213132322331323323132333131323223313232313232313231323111   <<    D1212121212131323223313233231323331313232233132323132323132313231113   >>      D1212121212131323223313233231323331313232233132323132323132313231112   >>