What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one z for which if z were sad, then z is running. For all z, if z goes running, then z is sad. For all z, z will not go running.
There is at least one z for which z is not sad. There is at least one z for which z is sad if and only if z will go running. There is at least one z for which z will go running if and only if z is sad.