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 overcast, then David is a poet. Mary is bored or David is not a poet. If it rains, then Mary is bored. It is raining.
Mary is bored can be inferred via the modus ponens rule. If David were a poet, then Mary is bored can be inferred via the rewriting rule.