D21221323131123313131333132233131133131323223313232211221123131   >>    D2122132313112331313133313223313113313132322331323221122112313   <<    D21221323131123313131333132233131133131323223313232211221123133   >>      D21221323131123313131333132233131133131323223313232211221123132   >>