C11111211113313112113313331333131133133313112211231213232233121   >>    C1111121111331311211331333133313113313331311221123121323223312   <<    C11111211113313112113313331333131133133313112211231213232233123   >>      C11111211113313112113313331333131133133313112211231213232233122   >>