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 a musician, then x_11 is taking a plane. For all x_11, x_11 is a musician or x_11 will not take a plane. For all x_11, if x_11 were a musician, then x_11 is poor. There is at least one x_11 for which x_11 is not poor.
There is at least one x_11 for which x_11 is not a musician can be inferred via the existential modus tollens rule. For all x_11, if x_11 takes a plane, then x_11 is a musician can be inferred via the universal rewriting rule.