What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_4 for which if x_4 plays a game, then x_4 is a nurse. For all x_4, if x_4 were a nurse, then x_4 is playing a game. For all x_4, if x_4 were a nurse, then x_4 is playing a game.
There is at least one x_4 for which x_4 will play a game if and only if x_4 is a nurse. There is at least one x_4 for which x_4 will play a game if and only if x_4 is a nurse. There is at least one x_4 for which x_4 is a nurse if and only if x_4 will play a game. There is at least one x_4 for which x_4 is a nurse if and only if x_4 will play a game.