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: For all x_2, x_2 will play squash or x_2 is not a writer. For all x_2, if x_2 plays squash, then x_2 is a writer.
For all x_2, if x_2 were a writer, then x_2 is playing squash can be inferred via the universal rewriting rule.