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_4 for which x_4 is poor. For all x_4, x_4 will not play squash. For all x_4, x_4 will play squash or x_4 will take a plane.
For all x_4, x_4 will take a plane.