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 write a letter or x_4 is rich. There is at least one x_4 for which x_4 is not rich or x_4 will play squash. For all x_4, x_4 will not write a letter.
For all x_4, x_4 is rich.