 Okay, now that we've looked at live, the question is, which one's a forced? So this part is not up to you. You don't get to determine which one must be true and the other one's false and vice-versa. Remember, forced means that at least one is true and the other one's false and vice-versa. You don't get to determine this. This is determined by the relationship between them. So I've run through the various propositions and now your task is to figure out which proposition is forced to that one.