What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_8, x_8 will not listen to a song. For all x_8, x_8 is a taxi driver if and only if x_8 will listen to a song. There is at least one x_8 for which x_8 is a mechanic if and only if x_8 is a sailor. For all x_8, if x_8 were a mechanic, then x_8 is a taxi driver.
For all x_8, if x_8 were a taxi driver, then x_8 is listening to a song. There is at least one x_8 for which if x_8 were a mechanic, then x_8 is a sailor. For all x_8, if x_8 listens to a song, then x_8 is a taxi driver. There is at least one x_8 for which if x_8 were a sailor, then x_8 is a mechanic. For all x_8, x_8 is not a taxi driver.