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 were curious, then x_15 is a carpenter. For all x_15, if x_15 reads a book, then x_15 is a carpenter. For all x_15, x_15 will listen to a song or x_15 will write a letter. For all x_15, if x_15 listens to a song, then x_15 is a janitor. For all x_15, if x_15 writes a letter, then x_15 is a janitor. For all x_15, x_15 is curious or x_15 will read a book.
For all x_15, x_15 is a janitor. There is at least one x_15 for which x_15 is a carpenter.