What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_5 for which x_5 is a musician or x_5 will read a book. For all x_5, x_5 will not work. For all x_5, x_5 will take a plane if and only if x_5 is a musician. For all x_5, if x_5 takes a plane, then x_5 is working.
For all x_5, x_5 will not take a plane. For all x_5, if x_5 takes a plane, then x_5 is a musician. For all x_5, if x_5 were a musician, then x_5 is taking a plane.