C212212121212113313132333131311331323331323132233132313232212121   >>    C21221212121211331313233313131133132333132313223313231323221212   <<    C212212121212113313132333131311331323331323132233132313232212123   >>      C212212121212113313132333131311331323331323132233132313232212122   >>