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 plays a game, then x_7 is not a nurse. There is at least one x_7 for which if x_7 were a sailor, then x_7 is playing a game. For all x_7, x_7 is a nurse and x_7 is happy.
For all x_7, x_7 is a nurse. For all x_7, x_7 is happy.