private static void build(String ord, Node node, int len, int index) {
		if (len > index) {
			char c = ord.charAt(index);
			HashMap<Character, Node> tempMap = node.barn;
			if (! tempMap.containsKey(c))
				tempMap.put(c, new Node());
			if (len > index + 1)
				build(ord, tempMap.get(c), len, index + 1);
		}
	}