public static SIIS deSerializeFile(File filename) {
		try {
			FileInputStream file = new FileInputStream(filename);
			ObjectInputStream o = new ObjectInputStream(file);
			SIIS tmp = (SIIS) o.readObject();
			o.close();
			return tmp;
		} catch (IOException e) {
			System.err.println(e);
		} catch (ClassNotFoundException e) {
			System.err.println(e);
		}
		return null;
	}