What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, x_4 will play squash. There is at least one x_4 for which x_4 will not play squash or x_4 is a sailor. For all x_4, if x_4 were a sailor, then x_4 is playing tennis. For all x_4, if x_4 were rich, then x_4 is playing tennis.
Nothing can be inferred from these premises.