What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? t -> q_2. p_16 <-> r_4. ~q_2. ~p_16.
~t. ~q_2 and ~p_16. ~p_16 and ~q_2. p_16 -> r_4. r_4 -> p_16. ~r_4.