D1212121212131323131133132311233132322331323321211113313231321221   >>    D121212121213132313113313231123313232233132332121111331323132122   <<    D1212121212131323131133132311233132322331323321211113313231321223   >>      D1212121212131323131133132311233132322331323321211113313231321222   >>