What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_17, if x_17 were a doctor, then x_17 is a writer. If Elisabeth were a writer, then Michael is a politician. If Susan were an astronaut, then Elisabeth is a doctor. If Michael were a politician, then Susan is an astronaut.
If Elisabeth were a writer, then Susan is an astronaut. If Michael were a politician, then Elisabeth is a doctor.