What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? U(a_10) or q. forall y_4: S_2(y_4) <-> U(y_4). S_2(a_10) -> r_1. q -> r_1.
forall y_4: S_2(y_4) -> U(y_4). forall y_4: U(y_4) -> S_2(y_4).