When engaging users with notifications, I have found that it is best to change up the copy every time the same notification is sent. This keeps the copy interesting and users more engaged. To achieve this, I setup a push notification message with 4 variants. Every time a reminder is sent to a user, I would like the variant to be selected at random so that they don't know what they are going to get. I do not want the variant to stay the same every time a notificatio is sent to the same user. Do you have any idea how I can accomplish this?