C12313211232233312111111312111133133313331333132232233122322121323232311   >>    C1231321123223331211111131211113313331333133313223223312232212132323231   <<    C12313211232233312111111312111133133313331333132232233122322121323232313   >>      C12313211232233312111111312111133133313331333132232233122322121323232312   >>