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 -> p_1. p_1 -> r_3. r_3 <-> t.
p -> r_3 can be inferred via the transitivity rule. r_3 -> t can be inferred via the biconditional elimination rule. t -> r_3 can be inferred via the biconditional elimination rule.