D1212121212131323223313233231323132313331323331311331323221313231311   >>    D121212121213132322331323323132313231333132333131133132322131323131   <<    D1212121212131323223313233231323132313331323331311331323221313231313   >>      D1212121212131323223313233231323132313331323331311331323221313231312   >>