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_13, if x_13 plays squash, then x_13 is listening to a song. For all x_13, x_13 will play squash or x_13 will work. For all x_13, if x_13 works, then x_13 is listening to a song.
For all x_13, x_13 will listen to a song can be inferred via the universal disjunction elimination rule.