What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: U(x) -> R(x). ~q. R(a_7) <-> q. forall x: R(x) -> U(x).
R(a_7) -> q. q -> R(a_7). ~R(a_7). forall x: U(x) <-> R(x). forall x: R(x) <-> U(x).