D1212121212131323131133132311233132313331333131111221123231323221111   >>    D121212121213132313113313231123313231333133313111122112323132322111   <<    D1212121212131323131133132311233132313331333131111221123231323221113   >>      D1212121212131323131133132311233132313331333131111221123231323221112   >>