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: s_2 -> w. p_2 <-> s_2. p_2 or ~w.
w -> p_2 can be inferred via the rewriting rule. p_2 -> s_2 can be inferred via the biconditional elimination rule. s_2 -> p_2 can be inferred via the biconditional elimination rule.