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 z_3, if z_3 were a musician, then z_3 is playing tennis. For all z_3, z_3 is a musician if and only if z_3 will play tennis.
For all z_3, if z_3 were a musician, then z_3 is playing tennis can be inferred via the universal biconditional elimination rule. For all z_3, if z_3 plays tennis, then z_3 is a musician can be inferred via the universal biconditional elimination rule.