What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~Q_13(a_6) or w. w -> u_3. forall x_13: ~P_13(x_13) or R_13(x_13). u_3 -> r_7. R_13(a_6) -> r_7. forall x_13: P_13(x_13) or Q_13(x_13).
w -> r_7. forall x_13: Q_13(x_13) or R_13(x_13).