C1111233131211111211113313331333133313331312331333131133133313232313121   >>    C111123313121111121111331333133313331333131233133313113313331323231312   <<    C1111233131211111211113313331333133313331312331333131133133313232313123   >>      C1111233131211111211113313331333133313331312331333131133133313232313122   >>