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_11, if x_11 were poor, then x_11 is a lawyer. For all x_11, if x_11 were a mechanic, then x_11 is not reading a book. There is at least one x_11 for which x_11 is not a lawyer. For all x_11, x_11 is poor or x_11 will read a book.
There is at least one x_11 for which x_11 is not poor can be inferred via the existential modus tollens rule.