What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: There is at least one x_4 for which x_4 will play squash. For all x_4, if x_4 plays squash, then x_4 is reading a book. For all x_4, x_4 will not read a book.
Since the premises are contradictory, we can infer anything from them.