C21221212121211331322132313132313132313232233132313223313311232221   >>    C2122121212121133132213231313231313231323223313231322331331123222   <<    C21221212121211331322132313132313132313232233132313223313311232223   >>      C21221212121211331322132313132313132313232233132313223313311232222   >>