C21221212121211331322132313132313132313232233132313223313231333133313232223211   >>    C2122121212121133132213231313231313231323223313231322331323133313331323222321   <<    C21221212121211331322132313132313132313232233132313223313231333133313232223213   >>      C21221212121211331322132313132313132313232233132313223313231333133313232223212   >>