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 x for which x is fast or x is sad. For all x, x will go running if and only if x is fast. For all x, x will go running or x is not sad.
For all x, if x were sad, then x is running. For all x, if x goes running, then x is fast. For all x, if x were fast, then x is running.