What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_8, x_8 is not a scientist. For all x_8, x_8 will listen to a song or x_8 is a scientist. For all x_8, x_8 will not listen to a song or x_8 will take a plane. For all x_8, x_8 will not take a plane or x_8 will write a letter.
For all x_8, x_8 is a scientist or x_8 will take a plane.