public static void contains() {
        int numberOfTimes = 5;
        long averageTime = 0;
        ArrayList tmp = new ArrayList();
        tmp.add("b40ee30c7");
        tmp.add("701006081");
        tmp.add("a008f10db");
        tmp.add("62084d097");
        tmp.add("8d0bc30aa");
        for (int j = 0; j < numberOfTimes; j++) {
            t4.start();
            HashMap<String, String> md51 = load("md5stream1.txt");
            HashMap<String, String> md52 = load("md5stream2.txt");
            for (int i = 0; i < tmp.size(); i++) {
                if (md51.containsKey(tmp.get(i)) && md52.containsKey(tmp.get(i))) {
                    System.out.println(tmp.get(i) + " kan findes i begge md5 streams");
                } else if (md51.containsKey(tmp.get(i)) && !(md52.containsKey(tmp.get(i)))) {
                    System.out.println(tmp.get(i) + " kan findes i første md5 stream");
                } else if (!(md51.containsKey(tmp.get(i))) && (md52.containsKey(tmp.get(i)))) {
                    System.out.println(tmp.get(i) + " kan findes i anden md5 stream");
                } else {
                    System.out.println(tmp.get(i) + " kan ikke findes i nogen stream");
                }
            }
            t4.stop();
            md51.clear();
            md52.clear();
            
            averageTime += t4.getElapsedTime();
        }
        averageTime = (averageTime / numberOfTimes);
        System.out.println("At finde de 5 elementer i de 2 streams tog: " + t4.toString(averageTime));
    }