D1212121221323132313233313131323132313231322331333223313232211111   >>    D121212122132313231323331313132313231323132233133322331323221111   <<    D1212121221323132313233313131323132313231322331333223313232211113   >>      D1212121221323132313233313131323132313231322331333223313232211112   >>