What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, x_9 will not read a book. Susan is rich if and only if Robert is playing squash. For all x_9, x_9 will play squash if and only if x_9 will read a book.
If Susan were rich, then Robert is playing squash. If Robert plays squash, then Susan is rich. For all x_9, if x_9 plays squash, then x_9 is reading a book. For all x_9, if x_9 reads a book, then x_9 is playing squash. For all x_9, x_9 will not play squash.