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_4, x_4 is a politician and x_4 will cook. For all x_4, x_4 will write a letter.
For all x_4, x_4 is a politician can be inferred via the universal simplification rule. For all x_4, x_4 will cook can be inferred via the universal simplification rule.