C212212121212113313221323131323131323132322331323132233132313232213123111   >>    C21221212121211331322132313132313132313232233132313223313231323221312311   <<    C212212121212113313221323131323131323132322331323132233132313232213123113   >>      C212212121212113313221323131323131323132322331323132233132313232213123112   >>