C12313211232233312111111312111133133313331323133313332221331212123213223311   >>    C1231321123223331211111131211113313331333132313331333222133121212321322331   <<    C12313211232233312111111312111133133313331323133313332221331212123213223313   >>      C12313211232233312111111312111133133313331323133313332221331212123213223312   >>