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_8, x_8 will listen to a song or x_8 is a politician. Robert is a taxi driver or John is not listening to a song. If John were a politician, then Robert is a taxi driver.
If John listens to a song, then Robert is a taxi driver can be inferred via the rewriting rule.