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_1 -> p_5. p_5 <-> p_1.
p_5 -> p_1 can be inferred via the biconditional elimination rule. p_1 -> p_5 can be inferred via the biconditional elimination rule.