C1111233131211111211113313331333133313331333133313331323133313113313123311   >>    C111123313121111121111331333133313331333133313331333132313331311331312331   <<    C1111233131211111211113313331333133313331333133313331323133313113313123313   >>      C1111233131211111211113313331333133313331333133313331323133313113313123312   >>