private List<String> getWordsSmallerThanKByType(int k, rankType type){

        ArrayList<RankedWord> rankedWords = new ArrayList<RankedWord>();
        for(String word : wordsSet) {
            rankedWords.add(new RankedWord(word, getRanks(word)));
        }

        Collections.sort(rankedWords, new RankedWordComparator(type));

        ArrayList<String> res = new ArrayList<String>();

        for(int i = 0; i < rankedWords.size(); i++) {
            if(rankedWords.get(i).getRankByType(type) >= k)
                break;
            res.add(rankedWords.get(i).getWord());
        }

        return res;
    }


    public List<String> getWordsWithAverageRankSmallerThanK(int k){

        return getWordsSmallerThanKByType(k, rankType.average);

    }

    public List<String> getWordsWithMinRankSmallerThanK(int k){

        return getWordsSmallerThanKByType(k, rankType.min);

    }

    public List<String> getWordsWithMaxRankSmallerThanK(int k){

        return getWordsSmallerThanKByType(k, rankType.max);

    }