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_14 <-> s. ~s. p_14 or u. ~q_4 or t.
p_14 -> s can be inferred via the biconditional elimination rule. s -> p_14 can be inferred via the biconditional elimination rule. ~p_14 can be inferred via the biconditional elimination rule.