What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? q_1. ~S_13(a_13). forall x_13: R_13(x_13) <-> S_13(x_13).
q_1 and ~S_13(a_13). ~S_13(a_13) 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).