D212213231311233131122112313331323221333131333132322112331323331323221231211   >>    D21221323131123313112211231333132322133313133313232211233132333132322123121   <<    D212213231311233131122112313331323221333131333132322112331323331323221231213   >>      D212213231311233131122112313331323221333131333132322112331323331323221231212   >>