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: If Linda takes a plane, then Michael is not listening to a song. For all z, if z writes a letter, then z is listening to a song. For all z, z will not drive a car or z will climb a mountain. For all z, z will drive a car or z will write a letter. For all z, if z climbs a mountain, then z is listening to a song.
For all z, z will write a letter or z will climb a mountain can be inferred via the universal resolution rule.