C212212121212113313221323131323131323132322331323132233132313231323211221   >>    C21221212121211331322132313132313132313232233132313223313231323132321122   <<    C212212121212113313221323131323131323132322331323132233132313231323211223   >>      C212212121212113313221323131323131323132322331323132233132313231323211222   >>