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_9 for which x_9 will go running if and only if x_9 is sad. For all x_9, x_9 is sad if and only if x_9 will go running.
For all x_9, if x_9 were sad, then x_9 is running. There is at least one x_9 for which if x_9 goes running, then x_9 is sad. For all x_9, if x_9 goes running, then x_9 is sad. There is at least one x_9 for which if x_9 were sad, then x_9 is running.