C12313211232233312111111312111133133313331323133313331122332321132312133112121   >>    C1231321123223331211111131211113313331333132313331333112233232113231213311212   <<    C12313211232233312111111312111133133313331323133313331122332321132312133112123   >>      C12313211232233312111111312111133133313331323133313331122332321132312133112122   >>