private void getKeywordsInSentence(String sen, int index) {
		Iterator<String> it = keywords.iterator();
		while (it.hasNext()) {
			String s = it.next();
			if (sen.indexOf(s) != -1) {
				if (!keywordExtracted.containsKey(s)) {
					KeywordInfo ki = new KeywordInfo();
					keywordExtracted.put(s, ki);
				}
				keywordExtracted.get(s).num++;
				keywordExtracted.get(s).indexOfSentence.add(index);
			}
		}
	}