What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~q_3 or s. s_4 <-> q_2. q_3. ~s_4.
q_3 and ~s_4. ~s_4 and q_3. s_4 -> q_2. q_2 -> s_4. ~q_2.