C12313211232233312111111312111133133313331323133313331122332321133122213121   >>    C1231321123223331211111131211113313331333132313331333112233232113312221312   <<    C12313211232233312111111312111133133313331323133313331122332321133122213123   >>      C12313211232233312111111312111133133313331323133313331122332321133122213122   >>