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: forall x_3: ~S_2(x_3). ~q_7 -> q. S_2(e) <-> q_7.
S_2(e) -> q_7 can be inferred via the biconditional elimination rule. q_7 -> S_2(e) can be inferred via the biconditional elimination rule.