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_8 <-> p_3. u -> t. ~p_8. p_3 <-> t.
p_8 -> p_3 can be inferred via the biconditional elimination rule. p_3 -> t can be inferred via the biconditional elimination rule. p_3 -> p_8 can be inferred via the biconditional elimination rule. t -> p_3 can be inferred via the biconditional elimination rule. ~p_3 can be inferred via the biconditional elimination rule.