C12313211232233312111111312111133133313331333132232233122323123223121   >>    C1231321123223331211111131211113313331333133313223223312232312322312   <<    C12313211232233312111111312111133133313331333132232233122323123223123   >>      C12313211232233312111111312111133133313331333132232233122323123223122   >>