C212212121212113313132333131311331323331323132233132333132313221231   >>    C21221212121211331313233313131133132333132313223313233313231322123   <<    C212212121212113313132333131311331323331323132233132333132313221233   >>      C212212121212113313132333131311331323331323132233132333132313221232   >>