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: t_2 -> W(e). forall z_3: ~W(z_3). t_2 <-> q_1.
t_2 -> q_1 can be inferred via the biconditional elimination rule. q_1 -> t_2 can be inferred via the biconditional elimination rule.