C12313211232233312111111312111133133313331323133313332322331212221212323121   >>    C1231321123223331211111131211113313331333132313331333232233121222121232312   <<    C12313211232233312111111312111133133313331323133313332322331212221212323123   >>      C12313211232233312111111312111133133313331323133313332322331212221212323122   >>