C21221212121211331322132313132313132313232233132313223313233313233313232112121   >>    C2122121212121133132213231313231313231323223313231322331323331323331323211212   <<    C21221212121211331322132313132313132313232233132313223313233313233313232112123   >>      C21221212121211331322132313132313132313232233132313223313233313233313232112122   >>