D1212121212131323131133132311233132322331323321211113313231333132322311221   >>    D121212121213132313113313231123313232233132332121111331323133313232231122   <<    D1212121212131323131133132311233132322331323321211113313231333132322311223   >>      D1212121212131323131133132311233132322331323321211113313231333132322311222   >>