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 y for which y is an astronaut if and only if y is excited. For all y, if y were a janitor, then y is reading a book. For all y, y is an astronaut or y will not read a book.
For all y, if y reads a book, then y is an astronaut. There is at least one y for which if y were an astronaut, then y is excited. There is at least one y for which if y were excited, then y is an astronaut.