public static void readFile(String filePath) throws Exception {
		instructionString = new ArrayList<String>();		
		try {
			BufferedReader inputf = new BufferedReader(new FileReader(filePath));
			String tmp = null;
			while ((tmp = inputf.readLine()) != null) {
				tmp = tmp.trim();
				instructionString.add(tmp);
			}
			inputf.close();
		} catch (IOException io) {
			System.out.println("File not found. Please provide a valid filePath.");
			}				
	}