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 -> u_1. t <-> w_3. u_1 -> w_3.
p -> w_3 can be inferred via the transitivity rule. t -> w_3 can be inferred via the biconditional elimination rule. w_3 -> t can be inferred via the biconditional elimination rule.