C212212121212113313221323131323131323132322331323132233132313231231211   >>    C21221212121211331322132313132313132313232233132313223313231323123121   <<    C212212121212113313221323131323131323132322331323132233132313231231213   >>      C212212121212113313221323131323131323132322331323132233132313231231212   >>