What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, if x_6 plays a game, then x_6 is a taxi driver. For all x_6, if x_6 were a taxi driver, then x_6 is sleeping. For all x_6, x_6 is a taxi driver or x_6 will not write a letter. For all x_6, x_6 will write a letter or x_6 will play a game.
For all x_6, if x_6 plays a game, then x_6 is sleeping. For all x_6, if x_6 writes a letter, then x_6 is a taxi driver.