C212212121212113313132333131311331323331323132233132313232211233132322311   >>    C21221212121211331313233313131133132333132313223313231323221123313232231   <<    C212212121212113313132333131311331323331323132233132313232211233132322313   >>      C212212121212113313132333131311331323331323132233132313232211233132322312   >>