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_11, x_11 will play tennis and x_11 is happy. If Robert were fast, then Jennifer is not playing tennis.
For all x_11, x_11 will play tennis can be inferred via the universal simplification rule. For all x_11, x_11 is happy can be inferred via the universal simplification rule.