What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_1, x_1 will read a book or x_1 is a doctor. Patricia is playing a game if and only if Barbara is a nurse. If Patricia plays a game, then Mary is not a doctor. Mary is not reading a book.
If Patricia plays a game, then Barbara is a nurse. If Barbara were a nurse, then Patricia is playing a game.