What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_15, x_15 is not a politician. For all x_15, if x_15 writes a letter, then x_15 is not rich. Barbara is writing a letter or it is cloudy. For all x_15, x_15 is a politician or x_15 is a nurse. For all x_15, if x_15 were a nurse, then x_15 is rich.
For all x_15, x_15 is a nurse.