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 will write a letter if and only if x will go running. For all x, if x writes a letter, then x is running.
There is at least one x for which if x writes a letter, then x is running. There is at least one x for which if x goes running, then x is writing a letter.