What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_6, if x_6 plays tennis, then x_6 is an astronaut. For all x_6, x_6 will work or x_6 is poor. For all x_6, if x_6 were an astronaut, then x_6 is happy. For all x_6, x_6 will not work or x_6 will play tennis. There is at least one x_6 for which if x_6 were poor, then x_6 is happy.
For all x_6, if x_6 plays tennis, then x_6 is happy can be inferred via the universal transitivity rule. For all x_6, x_6 is poor or x_6 will play tennis can be inferred via the universal resolution rule.