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: Susan is taking a plane if and only if it is cloudy. It is cloudy or Susan is not taking a plane.
If Susan takes a plane, then it is cloudy can be inferred via the rewriting rule. If Susan takes a plane, then it is cloudy can be inferred via the biconditional elimination rule. If it is cloudy, then Susan is taking a plane can be inferred via the biconditional elimination rule.