What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, if x_5 were a taxi driver, then x_5 is fast. For all x_5, x_5 is an office clerk. For all x_5, x_5 is a taxi driver. For all x_5, if x_5 were an office clerk, then x_5 is listening to a song.
For all x_5, x_5 is fast. For all x_5, x_5 will listen to a song. For all x_5, x_5 is an office clerk and x_5 is a taxi driver. For all x_5, x_5 is a taxi driver and x_5 is an office clerk.