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: w_1 <-> t. ~w_1. p or t.
~t -> p can be inferred via the rewriting rule. w_1 -> t can be inferred via the biconditional elimination rule. t -> w_1 can be inferred via the biconditional elimination rule. ~t can be inferred via the biconditional elimination rule.