D1212121212131323131133132311233132322331323321211113313231333132321311   >>    D121212121213132313113313231123313232233132332121111331323133313232131   <<    D1212121212131323131133132311233132322331323321211113313231333132321313   >>      D1212121212131323131133132311233132322331323321211113313231333132321312   >>