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: ~q_3. p_7 <-> q_7. q_3 <-> p. ~p_7.
~q_3 and ~p_7 can be inferred via the conjunction rule. ~p_7 and ~q_3 can be inferred via the conjunction rule. p_7 -> q_7 can be inferred via the biconditional elimination rule. q_3 -> p can be inferred via the biconditional elimination rule. q_7 -> p_7 can be inferred via the biconditional elimination rule. p -> q_3 can be inferred via the biconditional elimination rule. ~q_7 can be inferred via the biconditional elimination rule. ~p can be inferred via the biconditional elimination rule.