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 it is windy, then it is raining. It is not raining. James is sleeping if and only if it is windy. For all x_13, x_13 will sleep or x_13 is fast.
It is not windy can be inferred via the modus tollens rule. If James sleeps, then it is windy can be inferred via the biconditional elimination rule. If it is windy, then James is sleeping can be inferred via the biconditional elimination rule.