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