C1111233131211111211113313331333133313232313331333133313122121311   >>    C111123313121111121111331333133313331323231333133313331312212131   <<    C1111233131211111211113313331333133313232313331333133313122121313   >>      C1111233131211111211113313331333133313232313331333133313122121312   >>