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_14, x_14 is a carpenter. There is at least one x_14 for which if x_14 takes a plane, then x_14 is not a carpenter. For all x_14, x_14 will take a plane or x_14 will not cook. For all x_14, if x_14 writes a letter, then x_14 is cooking.
There is at least one x_14 for which x_14 will not take a plane can be inferred via the existential modus tollens rule. For all x_14, if x_14 cooks, then x_14 is taking a plane can be inferred via the universal rewriting rule.