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 is a scientist. There is at least one x_4 for which if x_4 plays squash, then x_4 is happy. For all x_4, x_4 will play squash.
There is at least one x_4 for which x_4 is happy. For all x_4, x_4 is a scientist and x_4 will play squash. For all x_4, x_4 will play squash and x_4 is a scientist.