How would you put the valid values 'silver' and 'gold' into a list?

To store the valid values 'silver' and 'gold' in a list, you simply create a list containing those strings. In Python: valid_values = ['silver', 'gold']. In JavaScript: const validValues = ['silver', 'gold'];. In Java: List<String> validValues = Arrays.asList("silver", "gold");. This creates an immutable list in Java; if you need a mutable list, use new ArrayList<>(Arrays.asList("silver", "gold"));. The list can then be used for membership checks, iteration, or any other operation that requires a collection of these values. If you need to add more values later, use the add() method in Java or push() in JavaScript.