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_7, if x_7 sleeps, then x_7 is a lawyer. There is at least one x_7 for which x_7 will climb a mountain. For all x_7, x_7 will sleep and x_7 will listen to a song.
For all x_7, x_7 will sleep can be inferred via the universal simplification rule. For all x_7, x_7 will listen to a song can be inferred via the universal simplification rule.