private boolean pInstruction(String instruction) {
		if(instruction.length() <= 2) return false;
		String spec = instruction.substring(2);
		int loc = 0;
		boolean isInt = true;
		try{
			loc = Integer.parseInt(spec);
		} catch (NumberFormatException e) {
			isInt = false;
		}
		if (spec.equals("all"))
			reg.printAll();
		else if( isInt || spec.equals("hi") || spec.equals("lo") || spec.equals("pc"))
			if (isInt) reg.printReg(loc);
			else reg.printReg(spec);
		else
			return false;
		return true;
	}