C1111233131211111211113313331333133313232313331333133313331311331323231322121   >>    C111123313121111121111331333133313331323231333133313331333131133132323132212   <<    C1111233131211111211113313331333133313232313331333133313331311331323231322123   >>      C1111233131211111211113313331333133313232313331333133313331311331323231322122   >>