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_6, if x_6 listens to a song, then x_6 is not a scientist. For all x_6, x_6 is an electrician. For all x_6, x_6 is a scientist or x_6 is not an electrician.
For all x_6, if x_6 were an electrician, then x_6 is a scientist can be inferred via the universal rewriting rule.