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