What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? R(a_7) <-> w. ~w. forall y: W_1(y) <-> R(y).
R(a_7) -> w. w -> R(a_7). ~R(a_7). forall y: W_1(y) -> R(y). forall y: R(y) -> W_1(y).