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 John cooks, then it is cold. Linda is taking a plane. If it snows, then it is cold. It is snowing if and only if Linda is taking a plane.
If it snows, then Linda is taking a plane can be inferred via the biconditional elimination rule. If Linda takes a plane, then it is snowing can be inferred via the biconditional elimination rule.