What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? s_4 or p_3. p_3 -> u_3. u_3 -> r_11. r -> r_11. q_6 -> r. s_4 -> q_6.
p_3 -> r_11. q_6 -> r_11. s_4 -> r.