C1111233131211111211113313231333133313331323331333133313232213231211   >>    C111123313121111121111331323133313331333132333133313331323221323121   <<    C1111233131211111211113313231333133313331323331333133313232213231213   >>      C1111233131211111211113313231333133313331323331333133313232213231212   >>