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 x_15 for which if x_15 reads a book, then x_15 is a janitor. For all x_15, if x_15 were a janitor, then x_15 is a police officer. For all x_15, x_15 will write a letter if and only if x_15 is a police officer. For all x_15, if x_15 writes a letter, then x_15 is reading a book.
There is at least one x_15 for which if x_15 reads a book, then x_15 is a police officer. There is at least one x_15 for which if x_15 writes a letter, then x_15 is a janitor. For all x_15, if x_15 writes a letter, then x_15 is a police officer. For all x_15, if x_15 were a police officer, then x_15 is writing a letter.