D1212121212131323223313233231323132313331323331311331323221323331111   >>    D121212121213132322331323323132313231333132333131133132322132333111   <<    D1212121212131323223313233231323132313331323331311331323221323331113   >>      D1212121212131323223313233231323132313331323331311331323221323331112   >>