What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it is overcast, then David is not a server. William is a scientist or Patricia is bored. If Patricia were bored, then David is a server. David is a server if and only if William is a scientist.
If David were a server, then William is a scientist. If William were a scientist, then David is a server.