C212212121212113313221323131323132313232233132112323133313211221   >>    C21221212121211331322132313132313231323223313211232313331321122   <<    C212212121212113313221323131323132313232233132112323133313211223   >>      C212212121212113313221323131323132313232233132112323133313211222   >>