C1111233131211111211113313331333133313232313331333131122233323311   >>    C111123313121111121111331333133313331323231333133313112223332331   <<    C1111233131211111211113313331333133313232313331333131122233323313   >>      C1111233131211111211113313331333133313232313331333131122233323312   >>