C21221212121211331322132313132313132313232233132313223313233311211   >>    C2122121212121133132213231313231313231323223313231322331323331121   <<    C21221212121211331322132313132313132313232233132313223313233311213   >>      C21221212121211331322132313132313132313232233132313223313233311212   >>