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: It is windy. It is overcast if and only if Linda is taking a plane. If it is overcast, then it is not windy. If Charles reads a book, then Linda is taking a plane.
It is not overcast can be inferred via the modus tollens rule. If it is overcast, then Linda is taking a plane can be inferred via the biconditional elimination rule. If Linda takes a plane, then it is overcast can be inferred via the biconditional elimination rule.