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: forall y: W(y). p <-> t. ~t.
p -> t can be inferred via the biconditional elimination rule. t -> p can be inferred via the biconditional elimination rule. ~p can be inferred via the biconditional elimination rule.