What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Michael is not a lawyer. Thomas is happy or David is a carpenter. Thomas is not happy or it is windy. David is a carpenter if and only if Michael is a lawyer.
David is a carpenter or it is windy. If David were a carpenter, then Michael is a lawyer. If Michael were a lawyer, then David is a carpenter. David is not a carpenter.