What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Jennifer is not a taxi driver. For all x_11, x_11 is a taxi driver if and only if x_11 will listen to a song. James is happy.
Jennifer is not a taxi driver and James is happy. James is happy and Jennifer is not a taxi driver. For all x_11, if x_11 were a taxi driver, then x_11 is listening to a song. For all x_11, if x_11 listens to a song, then x_11 is a taxi driver.