C21221212121211331322132313132313132313232233132311113313222211   >>    C2122121212121133132213231313231313231323223313231111331322221   <<    C21221212121211331322132313132313132313232233132311113313222213   >>      C21221212121211331322132313132313132313232233132311113313222212   >>