private String createCharacterSet(String charOptions){
		String characters = "";
		
		if (charOptions.toUpperCase().contains("N"))
			characters += "0123456789";

		if (charOptions.toUpperCase().contains("L"))
			characters += "abcdefghijklmnopqrstuvwxyz";

		if (charOptions.toUpperCase().contains("U"))
			characters += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

		if (charOptions.toUpperCase().contains("S"))
			characters += " !\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~";
					
		return characters;
	}