public Hashtable<String, Tuple<String, String>> extract_InSentence_naive(LinkedList<Tuple<String, String>> sentence) {
		Hashtable<String, Tuple<String, String>> relations = new Hashtable<String, Tuple<String, String>>();
		for(int i = 0; i < sentence.size(); i++){
			String relation = "";
			if(voc.containsKey(sentence.get(i).get_x())){
				for(int j = i+1; j < sentence.size(); j++){
					// We consider verbs between interesting terms.
					if(!relation.equals("") && (subvoc.containsKey(sentence.get(j).get_x()) || (subvoc.containsKey(sentence.get(i).get_x()) && voc.containsKey(sentence.get(j).get_x())))){
						relations.put(relation, new Tuple<String, String>(sentence.get(i).get_x(), sentence.get(j).get_x()));
					}
					else if(sentence.get(j).get_y().equals("V")){
						relation += sentence.get(j).get_x() + " ";
					}
				}
			}
		}
		return relations;
	}