What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, if x cooks, then x is not taking a plane. For all x, x will take a plane and x will make tea. There is at least one x for which x will go running if and only if x will cook.
For all x, x will take a plane. For all x, x will make tea. There is at least one x for which if x goes running, then x is cooking. There is at least one x for which if x cooks, then x is running.