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_5, if x_5 cooks, then x_5 is working. There is at least one x_5 for which x_5 is happy. For all x_5, x_5 will cook or x_5 is bored. For all x_5, x_5 will not work.
For all x_5, x_5 will not cook can be inferred via the universal modus tollens rule.