C1111233131211111211113313331333133313232313331333131133131122212121   >>    C111123313121111121111331333133313331323231333133313113313112221212   <<    C1111233131211111211113313331333133313232313331333131133131122212123   >>      C1111233131211111211113313331333133313232313331333131133131122212122   >>