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_4. p_11 <-> w_4. p_11 or s.
p_11 -> w_4 can be inferred via the biconditional elimination rule. w_4 -> p_11 can be inferred via the biconditional elimination rule. ~p_11 can be inferred via the biconditional elimination rule.