D1212121212131323131133132311233132313113313232222331323132322113221   >>    D121212121213132313113313231123313231311331323222233132313232211322   <<    D1212121212131323131133132311233132313113313232222331323132322113223   >>      D1212121212131323131133132311233132313113313232222331323132322113222   >>