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 were a taxi driver, then x_10 is a nurse. For all x_10, x_10 is a taxi driver. There is at least one x_10 for which x_10 is sad and x_10 will play a game.
For all x_10, x_10 is a nurse. There is at least one x_10 for which x_10 is sad. There is at least one x_10 for which x_10 will play a game.