private boolean isValid(String word){
		String[] stopWords = {"a","an","and","the","of","on","to","from",""," ","for","in","with"};
		
		for(int i=0; i<stopWords.length;i++){
			if(stopWords[i].equals(word.trim().toLowerCase())){
				return false;
			}
		}
		return true;
	}