C212212121212113313132333131311331323331323132233132311331323223313231221   >>    C21221212121211331313233313131133132333132313223313231133132322331323122   <<    C212212121212113313132333131311331323331323132233132311331323223313231223   >>      C212212121212113313132333131311331323331323132233132311331323223313231222   >>