C212212121212113313132333131311331323331323132233132332313231323221211   >>    C21221212121211331313233313131133132333132313223313233231323132322121   <<    C212212121212113313132333131311331323331323132233132332313231323221213   >>      C212212121212113313132333131311331323331323132233132332313231323221212   >>