C1111233131211111211113313331333133313331333133313331333121111331311221123121   >>    C111123313121111121111331333133313331333133313331333133312111133131122112312   <<    C1111233131211111211113313331333133313331333133313331333121111331311221123123   >>      C1111233131211111211113313331333133313331333133313331333121111331311221123122   >>