D1212121212131323223313233231323133313231323331311331323132332132322321   >>    D121212121213132322331323323132313331323132333131133132313233213232232   <<    D1212121212131323223313233231323133313231323331311331323132332132322323   >>      D1212121212131323223313233231323133313231323331311331323132332132322322   >>