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_4, x_4 will read a book or x_4 will not play squash. For all x_4, x_4 is a politician or x_4 will play squash. For all x_4, x_4 is not a politician.
For all x_4, x_4 will play squash can be inferred via the universal disjunctive syllogism rule. For all x_4, if x_4 plays squash, then x_4 is reading a book can be inferred via the universal rewriting rule.