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 Richard were happy, then Jennifer is driving a car. Richard is not happy. For all y, if y were a politician, then y is happy. If Jennifer drives a car, then Richard is a politician.
If Richard were happy, then Richard is a politician can be inferred via the transitivity rule.