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: There is at least one x_5 for which if x_5 reads a book, then x_5 is playing squash. For all x_5, if x_5 works, then x_5 is playing squash. For all x_5, x_5 will work and x_5 will drink water.
For all x_5, x_5 will work can be inferred via the universal simplification rule. For all x_5, x_5 will drink water can be inferred via the universal simplification rule.