are you a person3

public String generateResponse(ArrayList<String> words)
    {
        String response = null;
        String personquery = words.toString();
        if (personquery.contains("Are you a person?"))
            {
                response = "Of course I am a person.";
                return response;
            }

        for(String word : words){
            System.out.println(word);
        }


        HashSet<String> keywords = new HashSet<String>(words);
        Iterator<String> it = keywords.iterator();
        while(it.hasNext()) {
            String word = it.next();
            ArrayList<String> keys = new ArrayList<String>();
            keys.addAll(responseMap.keySet());
            for(String s : keys){
                if(word.contains(s)){
                    response = responseMap.get(s);
                }
            }
            if(response != null) {
                return response;
            }
        }
        // If we get here, none of the words from the input line was recognized.
        // In this case we pick one of our default responses (what we say when
        // we cannot think of anything else to say...)
        return pickDefaultResponse();
    }