What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_13: R_13(x_13) <-> S_13(x_13). q_1. ~R_13(a).
q_1 and ~R_13(a). ~R_13(a) and q_1. forall x_13: R_13(x_13) -> S_13(x_13). forall x_13: S_13(x_13) -> R_13(x_13).