C1111233131211111211113313231333133313331323331333133313232213231312311   >>    C111123313121111121111331323133313331333132333133313331323221323131231   <<    C1111233131211111211113313231333133313331323331333133313232213231312313   >>      C1111233131211111211113313231333133313331323331333133313232213231312312   >>