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_3 or p_8. t -> w. p_8 <-> t. p_3 -> w.
p_8 -> t can be inferred via the biconditional elimination rule. t -> p_8 can be inferred via the biconditional elimination rule.