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: t_3 -> t. p_12 <-> w_1. w_1. p_12 -> t.
p_12 -> w_1 can be inferred via the biconditional elimination rule. w_1 -> p_12 can be inferred via the biconditional elimination rule.