C12313211232233312111111312111133133313331333132232233122212212321   >>    C1231321123223331211111131211113313331333133313223223312221221232   <<    C12313211232233312111111312111133133313331333132232233122212212323   >>      C12313211232233312111111312111133133313331333132232233122212212322   >>