C21221212121211331322132313132313231313232233132313223313132311211   >>    C2122121212121133132213231313231323131323223313231322331313231121   <<    C21221212121211331322132313132313231313232233132313223313132311213   >>      C21221212121211331322132313132313231313232233132313223313132311212   >>