What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, if x_7 were a taxi driver, then x_7 is listening to a song. For all x_7, x_7 will write a letter or x_7 will play a game. There is at least one x_7 for which x_7 will not write a letter or x_7 is a taxi driver. For all x_7, x_7 will listen to a song if and only if x_7 will play a game.
There is at least one x_7 for which x_7 will play a game or x_7 is a taxi driver. For all x_7, if x_7 listens to a song, then x_7 is playing a game. For all x_7, if x_7 plays a game, then x_7 is listening to a song.