Consider the following premises. Thomas is poor. For all x, x will not go running. Richard is rich if and only if Jessica is running. Can we infer the following from them? Richard is rich.
 From the fact that for all x, x will not go running we can infer that Jessica is not running. Finally, from the fact that Richard is rich if and only if Jessica is running, and that Jessica is not running we can infer that Richard is not rich, which contradicts that Richard is rich. Therefore, the answer is no.