D1212121212131323331323231323132312323132322331311331323223313232213231321   >>    D121212121213132333132323132313231232313232233131133132322331323221323132   <<    D1212121212131323331323231323132312323132322331311331323223313232213231323   >>      D1212121212131323331323231323132312323132322331311331323223313232213231322   >>