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 z, z will play squash or z is a musician. For all z, if z plays squash, then z is taking a plane. For all z, if z were a musician, then z is taking a plane.
For all z, z will take a plane can be inferred via the universal disjunction elimination rule.