C12313211232233312111111312111133133313331323133313332221331212132233132112121   >>    C1231321123223331211111131211113313331333132313331333222133121213223313211212   <<    C12313211232233312111111312111133133313331323133313332221331212132233132112123   >>      C12313211232233312111111312111133133313331323133313332221331212132233132112122   >>