void normalizeFrequencies(int n) {
        for (Map.Entry<String, HashMap<String, Pair<Double, Double>>> entry : words.entrySet()) {
            double sum = 0;
            for (Map.Entry<String, Pair<Double, Double>> entry2 : words.get(entry.getKey()).entrySet()) {
                int value = frequencies.get(entry2.getKey());
                double newValue = entry2.getValue().getFirst() / value;
                entry2.getValue().setFirst(newValue);
                sum += (newValue * newValue);
            }
            sum = Math.sqrt(sum);
            for (Map.Entry<String, Pair<Double, Double>> entry2 : words.get(entry.getKey()).entrySet()) {
                double log = Math.log10( (double) n / entry.getValue().size());
                double newValue = (entry2.getValue().getFirst() * log) / sum;
                entry2.getValue().setSecond(newValue);
            }
        }
    }