What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, x_5 will work. For all x_5, if x_5 writes a letter, then x_5 is climbing a mountain. For all x_5, if x_5 works, then x_5 is a janitor. For all x_5, if x_5 were a janitor, then x_5 is writing a letter.
For all x_5, x_5 is a janitor. For all x_5, if x_5 works, then x_5 is writing a letter. For all x_5, if x_5 were a janitor, then x_5 is climbing a mountain.