C21221212121211331322132313132313132313232233132313223313131221   >>    C2122121212121133132213231313231313231323223313231322331313122   <<    C21221212121211331322132313132313132313232233132313223313131223   >>      C21221212121211331322132313132313132313232233132313223313131222   >>