Challenge exercise Write a method to play every track in the track list exactly once in random order. One way to do this would be to shuffle the order of the tracks in the list-or, perhaps better, a copy of the list-and then play through from start to finish. Another way would be to make a copy of the list and then repeatedly choose a random track from the list, play it, and remove it from the list until the list is empty. Try to implement one of these approaches. If you try the first, how easy is it to shuffle the list so that it is genuinely in a new random order? Are there any library methods that could help with this?