D1212121212131323131133132311233132322331333133313233231323221131   >>    D121212121213132313113313231123313232233133313331323323132322113   <<    D1212121212131323131133132311233132322331333133313233231323221133   >>      D1212121212131323131133132311233132322331333133313233231323221132   >>