What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_15, x_15 is not bored. For all x_15, x_15 is bored or x_15 will not play squash. For all x_15, x_15 will play squash if and only if x_15 will cook. John is cooking if and only if Sarah is a janitor.
If John cooks, then Sarah is a janitor. If Sarah were a janitor, then John is cooking. For all x_15, if x_15 plays squash, then x_15 is bored. For all x_15, if x_15 plays squash, then x_15 is cooking. For all x_15, if x_15 cooks, then x_15 is playing squash.