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_8, x_8 is a cashier or x_8 will take a plane. For all x_8, x_8 is a politician and x_8 will play tennis. For all x_8, if x_8 were a cashier, then x_8 is playing squash. For all x_8, if x_8 takes a plane, then x_8 is playing squash.
For all x_8, x_8 is a politician can be inferred via the universal simplification rule. For all x_8, x_8 will play tennis can be inferred via the universal simplification rule. For all x_8, x_8 will play squash can be inferred via the universal disjunction elimination rule.