What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? s_4. q_2 <-> w_2. ~w_2. s <-> ~q_2.
s_4 and ~w_2. ~w_2 and s_4. q_2 -> w_2. s -> ~q_2. w_2 -> q_2. ~q_2 -> s. ~q_2.