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: If it is late, then David is rich. It is late and it is windy. If David were rich, then Elisabeth is playing tennis.
If it is late, then Elisabeth is playing tennis can be inferred via the transitivity rule. It is late can be inferred via the simplification rule. It is windy can be inferred via the simplification rule.