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_6. p_4 <-> p_6. t_2 -> p_4.
p_4 -> p_6 can be inferred via the biconditional elimination rule. p_6 -> p_4 can be inferred via the biconditional elimination rule.