C11111211113313112113313331333133313331333121131211111133133313223321121   >>    C1111121111331311211331333133313331333133312113121111113313331322332112   <<    C11111211113313112113313331333133313331333121131211111133133313223321123   >>      C11111211113313112113313331333133313331333121131211111133133313223321122   >>