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_3, if x_3 sleeps, then x_3 is rich. There is at least one x_3 for which if x_3 works, then x_3 is sleeping. For all x_3, x_3 will not play squash or x_3 will play tennis. For all x_3, if x_3 plays tennis, then x_3 is rich. For all x_3, x_3 will play squash or x_3 will work.
There is at least one x_3 for which if x_3 works, then x_3 is rich can be inferred via the existential transitivity rule. For all x_3, x_3 will work or x_3 will play tennis can be inferred via the universal resolution rule.