C21221212121211331322132313132313132313232233132313223313111221   >>    C2122121212121133132213231313231313231323223313231322331311122   <<    C21221212121211331322132313132313132313232233132313223313111223   >>      C21221212121211331322132313132313132313232233132313223313111222   >>