What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_24, if x_24 climbs a mountain, then x_24 is working. For all x_24, x_24 will climb a mountain or x_24 will listen to a song. For all x_24, if x_24 listens to a song, then x_24 is working. William is a mechanic.
For all x_24, x_24 will work can be inferred via the universal disjunction elimination rule.