What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Susan is not a janitor. For all x_9, x_9 is not an electrician. For all x_9, x_9 is an electrician or x_9 will play squash. For all x_9, x_9 will not play squash or x_9 will take a plane.
For all x_9, x_9 will play squash.