What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If William drives a car, then Susan is fast. If William were a server, then Richard is a politician. If Susan were fast, then Richard is a politician. For all x_21, x_21 is not a server. If Richard were a politician, then William is a server.
If William drives a car, then Richard is a politician.