code: private String getNth(int n, List<String> list, String typeName) {
  		if (n < 0) {
  			throw new FuzzerException(name + ": " + n + ": " + typeName + " reference must be positive");
  		}
  		if (n >= list.size()) {
  			throw new FuzzerException(name + ": " + n + " illegal " + typeName + " position");
  		}
  		return list.get(n);
  	}
docs: Get a parameter/argument by its position.
  
  @param n position
  @return the parameter