public void debugPrint(){
		System.out.println("Sentences:");
		Iterator<String[]> it = sentences.iterator();
		while(it.hasNext()){
			String[] sentence = it.next();
			for(int i = 0; i < sentence.length; i++){
				System.out.print(sentence[i]);
				System.out.print(" ");
			}
			System.out.println();
		}
	}