What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, if x_10 listens to a song, then x_10 is writing a letter. For all x_10, x_10 will listen to a song. Some politicians will play tennis.
For all x_10, x_10 will write a letter. There is at least one x_10 for which x_10 is a politician. There is at least one x_10 for which x_10 will play tennis.