C1111233131211111211113313331333133313331333133313331333121111123223311   >>    C111123313121111121111331333133313331333133313331333133312111112322331   <<    C1111233131211111211113313331333133313331333133313331333121111123223313   >>      C1111233131211111211113313331333133313331333133313331333121111123223312   >>