C111123313331323113313331333133313331323132333133313211232212121   >>    C11112331333132311331333133313331333132313233313331321123221212   <<    C111123313331323113313331333133313331323132333133313211232212123   >>      C111123313331323113313331333133313331323132333133313211232212122   >>