What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? t_3 <-> w_3. R_19(a_19) <-> t_3. forall x_19: ~R_19(x_19).
t_3 -> w_3. R_19(a_19) -> t_3. w_3 -> t_3. t_3 -> R_19(a_19).