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: Karen is drinking water or Michael is sleeping. It is not cloudy. If it is cloudy, then Karen is drinking water. If Karen drinks water, then it is cloudy.
Karen is not drinking water can be inferred via the modus tollens rule. It is cloudy if and only if Karen is drinking water can be inferred via the biconditional introduction rule. Karen is drinking water if and only if it is cloudy can be inferred via the biconditional introduction rule.