C212212121212113313132333131313232233132321133131311331323221111   >>    C21221212121211331313233313131323223313232113313131133132322111   <<    C212212121212113313132333131313232233132321133131311331323221113   >>      C212212121212113313132333131313232233132321133131311331323221112   >>