C1111233131211111211113313331333133313232313331333133313321232221   >>    C111123313121111121111331333133313331323231333133313331332123222   <<    C1111233131211111211113313331333133313232313331333133313321232223   >>      C1111233131211111211113313331333133313232313331333133313321232222   >>