C111123313331323113313331333133313331323132333133313211232311311   >>    C11112331333132311331333133313331333132313233313331321123231131   <<    C111123313331323113313331333133313331323132333133313211232311313   >>      C111123313331323113313331333133313331323132333133313211232311312   >>