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_10, if x_10 were sad, then x_10 is a mechanic. For all x_10, x_10 is not a scientist. For all x_10, x_10 is sad or x_10 will not read a book. For all x_10, x_10 is a scientist or x_10 will read a book.
For all x_10, x_10 will read a book can be inferred via the universal disjunctive syllogism rule. For all x_10, if x_10 reads a book, then x_10 is sad can be inferred via the universal rewriting rule.