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: p_7 or ~s. p_7 <-> s.
s -> p_7 can be inferred via the rewriting rule. p_7 -> s can be inferred via the biconditional elimination rule. s -> p_7 can be inferred via the biconditional elimination rule.